Same here for me even with 17.6.2 , which fixed Linux UI-less guests not starting but actually for me added Windows 11 freezes.
One thing I noticed however - it does not freeze when just running at background, it freezes the moment you try to switch to it. Gets unfrozen after a couple of minutes although.
Restart of that Guest Win11 fixes the problem for couple of days, but once it runs again for some time it start to freeze and it happens mor frequrently , the longer it running. I guess they have some resource leak or something like that, that accumulates over time.