I was helping K7DAD with his IC-7300 and he experienced the situation where when hitting PTT it remained keyed up and did not release. I was unable to reproduce on my IC-7100 so we did two things:
1. I had him reboot the rigpi
2. I updated his rigpi to 1.05
My suspicion was that it was the first step that resolve it, but it's only a guess. I suspect that he had logged into the rigpi and opened the RigPI interface so that was connected to his Radio and then he opened it on his Phone simultaneously. Again, I don't believe he's reproduced it since.
I am setting up another IC-7300 on Thursday and will try to reproduce.