Why do ALL backups fail with "fault.InvalidLogin.summary" every few days

I am curious why we would have sucessful backups for the most part for a few days, then all of a sudden every single backup fails with this:

Error code: 241
Module: 83
LineInfo: c7610e0a857bee1a
Fields:
Message: VMware error: 'The user name or password is incorrect.'.
--------------------
Error code: 178
Module: 0
LineInfo: c7610e0a857bee1a
Fields:
Message: SOAP 1.1 fault: "":ServerFaultCode[no subcode] "fault.InvalidLogin.summary"

Is the vmProtect7 application not remembering the password to our SAN where to save the TIB files or logging into vcenter? None of the accounts are locked. Of course the passwords were typed into vmProtect correct because like I said, we had days of successful backups (minus 2 or 3 problem vms).