I have my doubts that you are going to get banned for disconnecting and reconnecting. There is no way to check if you are just having bad Internet or if you are doing this on purpose.

I had a Group once who did this but personally I think it is too much hazzle to disconnect all the time and relogg (at least for me). And at least lately with ShB if you get disconnected in a cutscene (from the main Story line) and Login again, you are starting again in this cutscene.

Don't know if they adjust this for the MSQ as well at some Point.