Same here!
Sometimes I'll be kicked off after 3 or 4 seconds inactivity.
Entering the harem, looking for the girl, return -> logged off in nearly in 100% of cases, even if it takes just some seconds.
Entering shop switching to affection shop, choosing girl, return -> logged off in 80% of the cases, even if it takes just some seconds
PVP, change crew -> logged off in nearly 100% of the cases. Makes it really hard to validate team changes.

This all is far beyond making fun, really thinking to drop my monthly pass till this is solved!