That could be partly due to the length of your ringtone. I have The Good the Bad and the Ugly ringtone and it needs to cycle through after it finishes. Custom ringtone by any chance?On many (but not all) incoming calls.... the phone rings 3 times, then stops, then restarts, on same incoming call.
I am sure it is on all call types, for example just happened on an incoming Whatsapp call.
Any clues as to solution.