My phone randomly freezes in different scenarios and then restarts. Sometimes, it happens even when I’m not using it. It just lies on the table, and I see it rebooting. It happens for no apparent reason, at least four times a day. I’ve been using the phone for two days. The automatic restart setting is turned off.After that, a report is created in Samsung Members. I have screenshot
If what @LongHiker suggests does not fix the issue, it is possible something is loose causing a very quick reset to happen. Like something causes static charges or electrical disruptions. I would call Samsung and set up (as fast as possible) to have the phone checked out for some physical issue inside the device. Note that Samsung is likely to request that you reset the device back to factory settings to be sure, so back up everything you want on that device.
Power off your phone, while powered off press power key and volume up button simultaneously until the phone vibrates, let go of buttons. You are now in the bootloader, using power for Yes volume buttons for scrolling, scroll down to wipe cache partition, press power, scroll to Yes, press power, reboot, power.
If that doesn't solve the problem, back up your device and factory reset.
If @Robin621k's steps do not resolve the restarts, and you are still experiencing an issue such as an inescapable boot loop, it may be a hardware issue such as a faulty motherboard.
In this case, you will need to visit a certified Samsung repair center to fully diagnose the issue and have any required repairs completed by a certified technician. Depending on the diagnosis, you may or may not have to ship the device off for repairs.
Given that the S25U is not yet a year old, your device should still be in warranty, and you should be eligible for a warranty repair if the issue is determined to be a result of a manufacturer defect.
