Can confirm seeing this exact same issue as well, still. 
Ubuntu 24.04.3 Server guest (fully updated) under Proxmox 8.4 host (fully 
updated). 
After approx 16 hours after a fresh boot, and then every 15 seconds after that, 
these errors are logged:
 [TTM] Buffer eviction failed
 qxl 0000:00:02.0: object_init failed for (4096, 0x00000001)
 [drm:qxl_alloc_bo_reserved [qxl]] *ERROR* failed to allocate VRAM BO

At that point the screen freezes and cannot be interacted with.

Enabling the serial console/terminal for the VM lets me access it via
the host at least.

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https://bugs.launchpad.net/bugs/2065153

Title:
  [qxl] Ubuntu 24.04 VM guest console freezes after some hours

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