FP6 Stuck on 'rebooting'

I have been using my FP6 perfectly fine for the last months.

Today I noticed some issues with my WiFi connectivity and wanted to restart my device.
Now I’m stuck at the “Rebooting” screen and don’t know how to proceed.

I was using the latest available e/OS/ version (3.7 I believe)

Any help is appreciated.

After 30 minutes and holding down the right-side button for 10-20 seconds (I swear I did this earlier, too) the phone finally rebooted.

After that my WiFi is working again normally. Still feels a bit odd though.