I have the same problem since opting into PTC in the PC app settings,
and allowing Beta releases on the Q2 settings. I undid both of those but
having same issue as you. Before Link worked fine so it's not my cable
or hardware,
Yes, I had this problem after I opted into PTC in the PC Oculus app, and
allowed access to Beta core software products on the Q2. I've disabled
both of these but Link still shows up as Oculus Link (Beta). Are you
using the Beta version?