Black display with incoming call

[Team_0]

Since the A11 update I have an intermittent problem with the display going black when a call comes in. I haven't been able to establish a firm pattern or situation when this happens, but I have a feeling that it is just when I'm using the phone with some other app. A call comes in, display goes black, the ring sound is active and I'm not able even to get the buttons visible at the bottom row. If I press the on/off, that cuts the call and after a moment the phone goes back to normal. 

In general, I am frustrated with Android as there can be so many different ways the phone  behaves with an incoming call. Most often you swipe up to answer, sometimes you get buttons at the top, sometimes an app can hide all this - and now the screen goes black.

I know that I might get crucified for this, but I do miss the Windows phone. Maybe there weren't all apps available, but it was a solid business phone that integrated well to the business infra and was totally predictable. Android is a toy. Sigh...

[Team_0]

To add to the previous, the phone is Xperia 5 II, with A11 and all apps are running latest versions. I have been playing with different screen and screen saver settings, but these haven't helped. 

[Lollytot]

I experienced this exact same problem only an hour ago  - except that I have Android 10 on an Xperia XZ3

[Strampke]

@Team_0 is it behaving the same in safe mode?

[Team_0]

Yes, no difference in Safe Mode. When trying to answer the call the screen went black. However, I was using my Bose headphones and by using the answer button at the headset I could start the phone call . When the call opened then the screen became normal. 

[EMS_MO72]

Can you try to do the ear proximity sensor test from the support app in and out of safe mode and check the results?

If the issue persist in both, try to perform software repair by the Xperia companion and check if it will work.