It does seem to cause an issue once you have too many MBs -- it's a known issue. I was told that a hotel room door can only be associated with up to 40 bands (e.g. you have 4 family members with access and each one has 10 bands on their
MDE account). After that point, it seems like random bands will not be able to access the room. Making some bands "inactive" online in MDE or marking them "lost" does NOT remove them from this total.
I knew for a while that this could be an issue. This trip, I took the time to go down to the front desk of the hotel and have them DELETE a bunch of old bands from our MDE accounts. I’m told only the front desk can delete bands permanently from the account. I went in and made a bunch of them "inactive" online myself as a way of letting them know which ones to delete.