System freezes while using thunderbird on Laptop-Display

[dj-digger]

Originally Posted by mlukaszek

Can you check if disabling intel_mmu helps?

No, it do not help... After reboot, system freezes while thunderbird is on laptop display and I click on another folder.

There is another programm affacted: ffDiaporama. Opened on laptop display and click on "Add Files", System chrashed.

I also noticed another strange thing... The system freezes but the loading animation of the mouse courser is still rotating... See attached video file.
I cannot move the mouse or enter any command on keyboard.

What else can I do? Thanks in advance