FP3 reboots during phone calls

Hi folks,
I had three reboots during phone calls right after each other (then decided to call with a different phone, was just too annoying). A more close inspection showed: The headphone plug was not perfectly down the jack. I had a few other calls later, with a properly inserted headphone, and those calls, despite being half an hour or longer, went through with no problems.
Quick question to those having the problem: Do you use cable connected headphones?
Happy Easter and take care!