Device Reboots after minutes in sleep

Hi,

My device goes to reboot when the display is turning off (by clicking the power button or display timeout).

When connected to a charger or when the display is on, no reboot occurs!

• I’ve tried to wipe all + installing a stable version of Lineageos but the problem persists
• I’ve checked this issue with 2 different batteries. Both are good.

Do you have an idea how to fix this?

Thanks!