Looking at your completed items trying to find a clue, I think that it may be something to do with selling a 'banned' Sony Playstation and selling food (chocolate eggs) on a private account instead of a business one (there are strict guidelines for selling any kind of food products in the UK).

With a permanently banned account eBay may hold any money for up to 180 days (the time in which a buyer can still issue a chargeback and get their money back).