I am on Byzantium with the latest gnome-calls version (43.alpha.0).
Although the software being alpha, it came as an update through the app store. Unfortunately this version, and also the version before this one, has stability issues.
This morning I received a phone call with the screen off. The answer dialog showed up briefly, but the answer button was grey and did not respond to a press. Shortly thereafter, the dialog disappeared from the screen and left me with the lock screen with the phone still ringing. I unlocked the phone and opened the calls app. I briefly saw the answer dialog again before it disappeared while the phone continued to ring, this time with two simultaneous ring tones. Closing the calls app didn’t stop the ringing, so I had to restart the phone. I know I could have used
killall gnome-calls in the terminal app, but restarting the phone seemed like a quicker way to handle the ruckus (I will create a desktop entry with the killall command for quick access in the future).
After the phone restarted, I again opened the calls app, which was not responding and not showing contact names in the recent list. After a few more reboots, the calls app was back to normal again.
Are there any log files I can supply to help track this issue?