X10III, v5.0.0.77 - it happens from time to time, reboot fixes it.
I would blame some fat Android apps, but I can’t find a reliable pattern for triggering it.
When the phone rings like that, I also have issues with the proximity sensor - my ear interacts with the touchscreen and mutes me, puts the call on hold, brings up the numerical keyboard, etc. Now, when the condition appears, I reboot it instead of picking the call 