SIMcard flipping after flashing lollipop 5.1 + firmware

Hello guys,

i got a realy strange and annoying problem:

Issue:
- cant unlock simcard
- SIMcardPIN UI is popping up again and again
- cant find any network operators (error)
- it shows my providers name for a second then turns off again and maybe prompt for simpin again
- SIM works fine in another phone

What i did so far:
OPO slimkat 4.4.4 working fine >> wiped all except storage >> flashed new TWRP > firmware > slimsaber > gapps (like stated in the slimsaber thread) >> PROBLEM Appeared >> flashed firmware again >> flashed resurrection remix >> CM12.1 nightly >> Slimsaber >> different / older firmware >> CM12 stable >> tried toggling on and off / rebooting / factory resets >> flashed XNPH05Q firmware + CM11s Calkulins_Stock_OPO_XNPH05Q
and still have the above mentioned issue.

Means i cant use my phone with the SIMcard inserted

I realy hope someone can help me and point me towards a solution!
Any advice is realy appriciated!