I think i have no random reboots anymore since i had to make a hard reset.
(I had to do that after activating quickboot without succes)
Be carefull a hard reset ERASE ALL DATA on your phone…
It could be interesting if other people can confirm that.
EDIT : i’m still experiencing some “random” reboots occasionally. More often when i’m charging the phone, close to 100%, but not only.