My phone screen going automatically blank

[user2QJzSY91sG]

My phone screen going automatically black and not starting by repetetive reboots also.

Phone vibrates and rings at that time due to notifications and calls,gets back to normal itself after 3-4 hours

[GooWinSungDroid A71]

Try clearing temp files, clear cached files, also check device care app. This issue is usually caused by low system memory or phone safety protection from heat damage.

[djones2021]

Where is it that you go to clear those things out ?

[Belaythatorder]

You may want to get that checked while it's still covered under warranty. In the mean time you can perform a partition cache clear. Its good for cleaning out the software bugs that sometimes come with OS and security updates. Here are the steps:
https://www.hardreset.info/devices/samsung/samsung-galaxy-note20-ultra-5g/wipe-cache/

[SamsungRei · Accepted solution]

Hello @user2QJzSY91sG, I understand how frustrating this is. We have received your private message and will follow up with you there.