Question problems with Samsung Galaxy S8

Feb 27, 2020
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There may be more but I have discovered three problems.....

1. When a call comes in and a green circle with a white phone icon appears on the screen, it doesn't work, so I can't answer any incoming calls

2. There is no point listening to the phone ringing and not being able to answer the call so I touch the red circle icon to end the call. That doesn't work either.

3. If a calendar reminder comes up you get a Dismiss icon showing. That doesn't work either.

Anyone know what is going on or what I can do about this. I have contacted Samsung Chat and received the usual platitudes but no solution. I can't be the only one with these problems can I?