I would attempt to find a match to determine how long the suspension is. Also unfortunately there is no way to discriminate between poor connection and someone simply pulling the plug on a system, and as such even for poor connection you can be banned. Also others likely reported you for bad connection, which is a reason that can result in suspension or permanent ban from match-made playlists as it overall affects other players' experiences negatively. I hope this all get resolved quickly for you but in the event that it doesn't I recommend staying way from crucible or gambit until your internet or general connectivity improves, otherwise you'll likely receive much longer bans.
Did you try to do a Match? The Suspension normally lasts only 30 minutes and as you received it some time ago, it should already be over (although the notification came later due to you logging out).