Samsung Galaxy S24 and S25 users report battery drain and overheating after April update [Updated]

Update 04/05/26 – 11:59 pm (IST): T-Mobile subscribers are taking the brunt of the battery drain and overheating issues triggered by the April update. Many have identified the carrier’s Mobile Services app as a massive power draw compounding the Knox Matrix bug.

A Galactic Samsung Care Ambassador on the official forums corroborated this link by confirming the latest T-Mobile updates are directly responsible for the widespread thermal and battery issues.

Some users tracked the Mobile Services application performing tens of thousands of background packet uploads in a matter of hours. This abnormal network activity appears to be tied to the T-Mobile Content Manager automatically downloading unprompted third party applications in the background.

T-Mobile customers currently dealing with a throttled device can find temporary relief by navigating to their system apps and uninstalling the latest updates for both Mobile Services and Knox Matrix until a permanent patch is deployed.

Original article published on April 23, 2026, follows:

Samsung’s latest software update seems to be cooking some Galaxy S24 and S25 phones. Since rolling out the April 2026 security patch, a growing number of users say that their devices are burning through battery life and running uncomfortably hot, even when idle.

Reports suggest that for many users, the battery is dropping fast enough to require multiple charges a day. In one of the bigger threads on Reddit, an S25 Ultra owner reported their device draining 40% of its charge in just two hours with no screen use.

Others say the phones are getting hot to the touch. So this isn’t the typical indexing that occurs after an update, causing the phone to get warm.

In most cases, after users dug into their battery usage stats, they noticed one clear suspect: Knox Matrix. According to users on Samsung Community forums, the system app is pulling well over its normal share of power, running constantly in the background and keeping the processor awake.

Someone in the comments even shared a screenshot for reference. Check it out below:

For context, Knox Matrix is a core piece of Samsung’s security architecture and it’s the backbone of their end-to-end encryption for cloud backups and cross-device syncing. You can’t just easily uninstall it.

Some users in another forum thread have tried the usual triage. They’ve cleared cache partitions, wiped data, enabled battery-saver modes, and even booted into safe mode. Nothing really sticks.

From what I was able to deduce, a few people have found a messy temporary fix by navigating to system apps and uninstalling the latest updates for Knox Matrix. It stops the drain for some.

Others found that simply turning on power-saving mode stops whatever loop Knox Matrix is stuck in. But having to throttle a $1,300 phone just to make it through a shift at work is not great.

Right now, Samsung hasn’t publicly acknowledged the bug, though community moderators have been asking users to submit diagnostic reports.

You can find more reports here and here, showing the issue stretching across both the S24 and S25 lines. We’ll keep an eye out for a hotfix.

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