I’m using infuse 6 Pro now and it’s still happening. Happened with inFuse 5 as well. Been going on for the last few months.
I thought it was normal behaviour because if I don’t switch over to after hours WiFi or forget to and Open infuse while it’s still connected to normal hours WiFi (which doesn’t have Internet connectivity during after hours) - and I open infuse and it tries to sync without internet available…it loses all my synced files.
And to get them back I have to do a sync and make sure internet Is available.