Hi and welcome to PCHF, i will try my best to fix ur problem, it seems anyway to only be a matter of ur computer not supporting it
there is a chance that if ur computer can not handle the
cpu core u put in it has a feature that is ticked for if there is a system error or malfunction for it to restart, otherwise if this feature was disabled, ur computer would have all sorts of problems like constant error messages and disturbing freeze times. I recommend upgrading ur computer so it supports the newly installed hardware