Hey, the problem occures for me since i bought my phone. It doesn’t happen very often but mostly when i am calling someone. It forces a restart while calling or while phoning. I cannot really say much about the circumstances and why it happens. I don’t use an app to call or don’t use any in-depth-app on my phone. What i use is the energy save mode from android.
Couldn’t find a thread so far from others who have the same problem so it might be an individual cause?