[Q] Signal lost after screen goes dark topic

I installed CM 12.1 with gapps on my S4, problem is when my screen goes dark(when pressing power button once or automaticly after 5mins) my signal is gone. When rebooting phone the signal is back or if I quicly do airplane mode on and then off again the signal is also back. So basicly I only have signal when the screen is on and not turned off at any point.

Tried flashing another rom but had same problem, any idea's what it could be?