This thread may be of some interest (and the link to the related post in the Adobe support forums). Short story - you're not alone and at least Adobe appear to be working the issue:
https://www.mobileread.com/forums/showthread.php?t=28974
The posts on the Adobe forums indicate that it is possible for their customer support (US maybe?) to reset your authorization counter, if that's any help. You can post a trouble ticket from their website.
Regards,
Bob