Phone thinks USB is always connected

Hi,
I have a massive problem.
The phone started thinking USB is connected, and always shows the "USB for charging" notification.
I need to turn it off, plug in usb, start it again to make it charge
And much worse: when I remove the USB, it keeps a wakelock, because it thinks USB is still connected.
running CM13 nighly built on the 16th.
Wiping cache did nothing
I really hope you have some idea, else I have to factory reset and send it in for replacement :(
Thank you all

Apps still thinks I have older version 4.3 after CM12 install?

I just installed CM12 with correct gapps and phone is working fine. I did it so my kids could download Pokimon Go as pokimon wants a new version then 4.3. After hours of cruising the info on this formum I was able to root, install twrp and install CM12 and the gapps. It works great. However, Pokimon still says I have an older version. I checked in my settings and it says I now have 5.0.2. Is there something else I can change to let pokimon on this phone!
The rom I installed is: cm-12-20150116-UNOFFICIAL-t0lte
the gapps is: pa_gapps-modular-pico-5.0.1-20150221-signed
Thanks to everyone on this forum and the wealth of knowledge.
DC