Welcome!

I was just banned for 48 hours.. logged in didn't do anything and 5-10 seconds later I'm logged out and banned. It could be a coincidence but it sure as hell looked like an auto ban via client detection.

Perhaps tele to bank support / special locations? Works good but have to stop it everytime I get a full load because there is no bank on the island.

What I'm basically saying is that if no one is listed as making a connection to Runescape with any computer but yours and no one would ever use your computer it is impossible for anyone else to have taken it. If you were holding your items or armor on you and you died while using the massfighter...

Well based on that information you can rule out being 'hacked'. Like insomniac said you probably got robbed.. your ip log history points to someone in your household using your computer and that's all you would really need is access to the wireless network/cpu and then you can go about using...