Well, if you didn’t update your H90 or H90 Control, then the only thing that’s left is your antivirus software having had an update that is preventing your H90 from working.
I’d suggest checking your update history; I’ll bet that you recently received an update to the software that triggered this. Perhaps check in with Avast’s customer support.
Alternately, maybe there is a hint as to what the issue is in the antivirus logs; see here: https://businesshelp.avast.com/Content/Products/General_Help/LogLocations/BaseAntivirusLogs.htm for locations.
