normally the 3102 error code I believe is what you are show when the server thinks you are still logged in. This doesnt mean someone hacked you and you are still there its a bug that many of us have had to deal with that is just the server still reading you as being on.

I have had to deal with this as have alot of other ppl. It may have other meanings as well but this is the one I have encountered. I just walked away, read a couple chapters in a book, came back and logged in fine. If all else fails you can try to contact lolcustomersupport