I own an HTC 10 mobile telephone and it operates on Android, version 8.0.0

I want to use a calendar with repeating aural (noisy) reminders, and to this end I purchased '3C Business Calendar', which as far as I can see is just a souped up version of Google Calendar, with prettier pictures.

I can live with both the 3C and the Google calendar except that when I have set an alarm (or alarms) I can't get it either of them to stop ringing. In fact, the only way I can quieten them is to cancel the item I want to remind to, which is a bit of a PITA.

I've tried everything with both the Business Calendar and the Google calendar but nothing works, It just rings and ring and rings….

Is this liable to be the problem of the HTC10, or is it a Google problem, can anyone help me?

Xavier