RaspberryPi4 displayed as online but cannot access anymore
I am accessing a couple of RPI4 over Teamviewer and occasionally I cannot access them anymore though they are still displayed 'online' for several hours.
The error on Tetamviewer is simply:
No connection to partner
Error: Wait for connect failed
The application I am running on it got also stuck (I can see that over the internet) so the actual 'freezing' is not a problem of Teamviewer but the RPI got stuck and TV still displays it as online. Do you have any troubleshooting ideas?