VBox 7.1.6 - Linux guest Desktop GUI freeze

[sunrider]

Host: Ubuntu 22.04, kernel 5.15.0-131
Guest: Ubuntu 22.04, kernel 5.15.0-131
VBox 7.1.6 (host, and guest additions), problem also with guest additions 7.1.4 (tested as a downgrade)

Since upgrade from VBox 7.1.4 to 7.1.6, two of my Ubuntu guest VMs experience "desktop freeze" conditions, i.e. the GUI becomes unresponsive. This is independent of whether any application programs are running in the guest OS. But when programs are running, it appears that the freeze occurs earlier. It takes minimum a few hours before such a freeze occurs, but also >48 hours have been observed.

The desktop GUI is unresponsive, but the VM can be shut down with a Machine >> ACPI shutdown signal from the menu.

It is totally unclear what is causing these freezes. VM logs do not reveal any direct information.
The problem does NOT appear in Windows 10 guests.

These problems definitely did not show in VBox 7.1.4 or before.

Any ideas what the problem may be or how to analyse this?

[linux on intel mac]

i had this desktop freeze problem (vb 7.1.6, macos 15.3 host, xubuntu 24.04.1 guest) and from reading your post decided to reinstall the guest additions using the old 'insert guest additions cd' process instead of 'update guest additions' i used first time. vm has stayed responsive an extra 24 hours & counting.

[sunrider]

i had this desktop freeze problem (vb 7.1.6, macos 15.3 host, xubuntu 24.04.1 guest) and from reading your post decided to reinstall the guest additions using the old 'insert guest additions cd' process instead of 'update guest additions' i used first time. vm has stayed responsive an extra 24 hours & counting.

I always use 'insert guest additions cd' and manually start the install from the shell.