Hi @paulakreuzer, I have had the same problem since I got the phone almost two months ago. I tried to clean the proximity sensor, but it does not help. Both when I call out, and someone calls in mye screen goes black when I reply to the phone. I also have the same problem when charging my phone, that my screen goes black, and I therefore cannot use the phone.
Should I report this to support, or do you think this will be resolved in the next software update?