I have had the same problem for a few days. Sometimes it seems to me that the leather / fabric cover is statically charging the display and causing the effect. When you slide it out of the case, the typing starts. Strange... 😕
I was shocked to discover that the Bluetooth loudspeaker was not working. : - \
The phone came yesterday, after eleven months, and I was already thinking that I would have to send it back. Thank you for your solution. It works.