Random freezes during normal usage

MyFP2 randomly freezes during usage. Touch screen does noto work, as well as physical buttons.
Only way to solve is to remove battery.
It happens twice a week.
OS is updated to latest version 1.11.1
No SD card; just SIM2 slot in usage.

Any suggestion?
I use FP2 for business, I need it to be stable.

Thanks in advance

A post was merged into an existing topic: Fairphone 2 touchscreen suddenly freezes