Galaxy S25 battery drain linked to Samsung One UI update


Samsung’s latest software update might be doing more harm than good for some Galaxy users.

Following the April 2026 security update, owners of the Galaxy S25 and Galaxy S24 are reporting serious battery drain and overheating issues. Complaints are quickly piling up across forums and Reddit.

The issue appears to have started shortly after the update began rolling out earlier this month. Since then, users say battery life has dropped off a cliff. In some cases, it has dropped dramatically. One Galaxy S25 owner claims their phone is dying in just a couple of hours, while another Galaxy S24 user says their device now lasts under three hours and takes significantly longer to recharge.

It’s not just isolated cases either. Threads across Samsung’s community forums, and echoed on Reddit, paint a consistent picture. Users have described their battery performance as “trash” over the past few weeks. One says they’re now regularly hitting 20% by the time they get home, something that “never used to happen.” Others have simply said: “So it’s not just me.”

Digging into battery stats, some users believe they’ve found the culprit: Knox Matrix. The built-in security system detects threats and protects connected devices. However, it appears to be running constantly in the background and putting heavy strain on the CPU. Screenshots shared online show it consuming an unusually high amount of power compared to other system processes.

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That could explain both the battery drain and the overheating reports. Knox Matrix is deeply integrated into Samsung’s ecosystem, so users cannot simply remove or disable it like a regular app. This makes this a trickier issue to work around.

So far, Samsung hasn’t officially acknowledged the problem. However, moderators on the company’s forums are advising affected users to visit service centres so technicians can investigate further. It’s also worth noting that the issue does not appear to affect every device, suggesting this could be a bug affecting certain configurations rather than a universal issue.

For now, if your Galaxy S25 or S24 has suddenly started burning through battery after the latest update, you’re definitely not alone. Also, it might not be something you can fix on your own just yet.



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Recent Reviews


Gemini on Android Auto

Kerry Wan/ZDNET

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ZDNET’s key takeaways

  • Gemini is now widely available in Android Auto.
  • It can integrate with Google services and other apps.
  • The AI answered both simple and complex, multi-step questions. 

Despite Google’s insistence on packing artificial intelligence into nearly every conceivable product, I haven’t really found too much day-to-day use for it. That might change now. 

Over the weekend, I noticed my Android Auto had updated to include Gemini. I decided to give it a quick test, and it deftly answered my questions. When I started to dive deeper, though, I was surprised by just how much it could do and how easily it handled what I thought were more complex asks.

Also: Your Android Auto just got 5 useful upgrades for free – and Google isn’t done

Here are some of the best ways I’m using the new Gemini integration. To get started for yourself, you can either use the mic button on your steering wheel or say “Hey Google.” 

1. Finding hours or other information about local businesses

When using my phone in the car, most of the time I’m checking hours for a local business or researching nearby restaurants or stores. I found that Gemini is perfect for quick, simple questions like, “What time does Tony’s Ice Cream close?” But it’s also great for diving a little deeper.

I’m the type of person who likes to do a lot of investigating when I’m trying to find a new restaurant. I like to know what makes each one special and what people recommend — before I decide. Gemini does very well in situations like this. 

Also: Google just gave Android Auto its most significant update yet – and we tested it on the road

I asked for the best local spots to find ice cream. Instead of just showing a list, Gemini began detailing each spot, noting that the number one recommendation was “a legendary local spot with more than 100 years of history scooping up happiness.” It went down the list, offering up recommendations about each option, and then it even asked which one I wanted to navigate to.  

2. Tracking down info deep in your email

My wife and I had tickets to a show this weekend, and while I knew where I was going, I decided to see if Gemini would help. Without mentioning the theater or the show’s name, I just asked, “What’s the address for the show tonight?” Gemini thought for a few seconds and then replied that my confirmation email didn’t mention an address before asking, “Do you want me to find that information online?” When I said I did, it quickly found the address and offered to start navigation.  

I asked Gemini several other email-specific questions like “What’s coming in the mail today?” (thanks to USPS Informed Delivery) and even some vague ones like “When is that thing I ordered from the TikTok shop arriving?” or “I remember a coupon for a haircut in my email, when does that expire?” It handled each one perfectly.

Also: How to clear your Android phone cache – and why it greatly improves performance

Instead of opening my Gmail app, scrolling to find what I need or searching, and then opening the message, I can now get this info quickly with Gemini’s help.

3. Getting answers on the go, and keeping the conversation going

I’m the type of person who immediately looks up the answers to random questions that pop in my head — things like, “Where is the Australian Shepherd dog breed from,” “How do I make polymer clay earrings?” (my wife had seen some at a vendor fair), or “How do I make an electromagnet for an elementary school science project?”

Instead of Googling these queries, I asked Gemini. I wasn’t surprised to get a response, but I was surprised by how Gemini offered to keep things going. Every time Gemini offered an answer, it would ask if I wanted to talk more. I found myself having a conversation about my dog and why he doesn’t shed nearly as much as my other one, about the best way to present my son’s electromagnet, and even about different ways to make clay earrings and which option was best. 

4. Saving reminders and notes

I live by my Google Calendar, and if I don’t have something saved there, there’s a good chance I’ll forget it. The same goes for my reminder list in Google Keep. Quite often, while I’m driving, I’ll have a thought I want to remember later. Gemini, through Android Auto, was able to add things to my Keep lists and add things to my Calendar. It also gave me a rundown of what’s on my calendar and even asked if I wanted help getting ready for a meeting tomorrow (which was actually my wife’s event on our shared calendar). 

Also: The best AI chatbots: Expert tested and reviewed

5. Picking the perfect playlist

When it comes to the radio in my car, I’m constantly bouncing between podcasts, the song that got stuck in my head because it was viral on TikTok, whatever my kids request, or a huge variety of other songs. That means I’m often bouncing between Spotify, YouTube, and my XM radio. 

I often want to hear a specific song or album, and I was able to get Gemini to pull up specific songs using Spotify and YouTube and to stick to songs from that album. When I was in a more general mood, I got Gemini to tune to a specific XM station for me. 

I haven’t stumped AI yet

Overall, I’m finding that Gemini can handle at least 90% of tasks I’d otherwise pick up my phone for, from basic questions to more in-depth, multi-level questions. It was able to integrate with Google services like Gmail and apps, but also several other apps. 

Also: Google’s Gemma 4 model goes fully open-source and unlocks powerful local AI – even on phones

The basic questions are more common, but the ones that require research are where Gemini shines. I kept trying to think up new things to ask, and I had trouble finding something that would genuinely stump the AI. If, like me, you haven’t really embraced Gemini yet, Android Auto might just be your ticket in. 





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