I ask for help because generally in my Mi A2 Lite I cannot answer incoming calls ... The mobile rings, rings and shows the notification and the incoming call button and when trying to answer, that incoming call screen stays and I must  wait for a while until it is removed and it is literally impossible to receive the call.  Then I have to call back.  this fails sometimes presents it, I mean one day I can normally answer the calls and other days I can't.  Thank you very much in advance