Samsung Galaxy S10 randomly shuts down/reboots, sometimes bootloops, and temperature reaches 62°C — what could cause this?
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Hi, I’m trying to figure out what is wrong with my Galaxy S10 (SM-G973F).
The phone has worked for around 5 years without any problems, including no overheating issues or noticeable battery problems.
Then suddenly one day:
- Left the phone untouched on my desk for ~1 hour.
- Came back and it was completely powered off.
- Tried turning it on → Samsung logo → shutdown → repeat, causing a bootloop for ~2 hours.
- Eventually managed to boot it, but it only worked for ~5 minutes before shutting down and bootlooping again.
- Cooling the phone down allowed it to boot normally again.
- Before the factory reset, the phone was consistently running at around 60–63°C, sometimes reaching ~65°C, even during relatively light use.
- I backed everything up, then performed a factory reset.
- After the factory reset, the bootloop problem has not happened again. However, the phone has still randomly rebooted a few times.
- It can run normally for 5–6 hours, then randomly reboot once and continue working normally afterward.
- Before one reboot it was around 60°C, but immediately after the reboot it dropped to around 40°C while doing the same tasks.
- I can currently stress the phone and get one thermal sensor to ~60°C without it shutting down.
- The issue is therefore intermittent and I can't reliably reproduce it.
The battery is the original battery, has never been replaced, charges normally, and seems to hold charge normally.
I also have an ADB diagnostic report. The most interesting part shows:
Kernel PANIC
EXT4 ... ext4_find_entry ... sda31
The phone has already been factory reset, so there are currently no old apps/data causing this.
What could cause this behavior? Is this more likely to be a failing UFS/storage chip, motherboard/power issue, thermal issue, or some kind of kernel/filesystem problem?
I'm especially interested in why the phone could stay around 60–65°C before a reboot, then immediately after reboot run at around 40°C under the same workload.