In 2011 I spent a few months in Berlin and opened an account with Berliner Sparkasse. I left the country (returned to the UK) but neglected to close the account (every interaction with the bank involved stretching my very weak German in person, and I had other things on my mind at the time). I've never heard from them since (but it's possible they tried to contact me at my Berlin flatshare; I'm not sure if I ever gave them my UK address).
The account had some sort of monthly charge, so presumably eventually 'ran dry' of the (fairly small) amount left in it when I left. I don't know if that charge could have put it into overdraft. Should I try to get in contact and find out what happened? Is this likely to cause me any trouble if I ever want to live in Germany again? Could it come back to bite me in the UK?