I recently upgraded F28 to F29, after installation no problems occured but after reboot I got screen freezes every time I used my mouse cursor for the first time.

Later on I did a complete fresh install of F29 and same problem occured : after installation all was well, but after the first reboot I got the frozen screens again.
I did a fresh install, and the problem occurred both with and without a -dnf update- after installation. Also, using Gnome classis/wayland/xorg did not matter.

Any suggestions on how about to find the root cause of this ?

Thanks&regards, Robert