Screen Blinking then rebooting randomly

Hello,

This few days and after what is seems the security upgrade, my phones has a strange comportement. Whenever the charge of the battery (40%, 60%, 80%). My phone does something fast blinking then reboot constinuisly until sometimes it suceed and when i tried to unlock and redo the same except if i keep charged.

Even during reboot, i could see the blinking.

So, i nearly keep charged but sometimes when it’s worked without which strange i doesn’t have any error for lawnchair or anything.

Battery seems to be fine (my phone is only 1 year) when i try to it’s static.

I tried to search on the forum but i doesn’t any reply on this kind of problem and doesn’t begin to dig up (i begin to backed up my phones). I planned to retrieve the log for seeing the errors.

Before dig in further, does anyone already this comportment with it fairphone ?