Hi there. Out of nowhere the dialler on my P20 Pro has stopped working. I can make calls but then the dialler screen disappears and is viewable only in the notification banner much like if you navigated to another screen whilst on a call. The difference here being that where it says "touch to return to call" doesn't work to let me return to the main dialler screen so I can't end the call. Has anyone had this problem & been able to implement a fix? Screenshot below of exactly what I'm seeing when I make a call now.