Sleuths may have tracked down the bug cooking Galaxy S25 Ultra and S24 Ultra batteries

Credit: C. Scott Brown / Android Authority TL;DR Galaxy S25 Ultra and Galaxy S24 Ultra owners have been reporting battery drain and overheating issues after installing the July security patch. Users are noticing that the problem appears to be connected to WhatsApp.

It’s reported that a bug in the update prevents WhatsApp from completing the backup process, causing it to run continuously in the background. Security patches are meant to fix bugs, not introduce them. However, the latest security update from Samsung may be causing trouble on some Galaxy S25 Ultra and S24 Ultra devices.

The affected owners now appear to have found the root cause of the problem. Samsung released this month’s security patch on July 7. After installing the update, an influx of Galaxy S25 Ultra and S24 Ultra users have been reporting ( 1 , 2 , 3 ) trouble with battery life and overheating.

Initially, it was unclear what the problem was, but users have narrowed it down to WhatsApp.