I was having the same problem, but was able to resolve it today. The phone would ring, but the little window to accept or reject the call did not appear. The only way to answer was to swipe down and answer the call through the notification, if I could do that quickly enough. If I was in my car, I could also answer through the car's interface. The problem for me started maybe a week or so ago, when I noticed my scheduled Do Not Disturb (at night) was no longer working - I was getting buzzed at all hours. I cannot recall if I manually turned on Do Not Disturb after that, but when I checked today, Do Not Disturb was turned on. I turned that off, and then I turned on my scheduled Do Not Disturb. Calls are now coming through again, with the ability to answer. Hopefully Do Not Disturb will still work as scheduled at night.
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