My son is having this problem as well. I know for a fact he hasn't done any cheating/gold buying (yes, I really do). He went on a trip for about 5 days, then when he came back to log in today, bam, banned. Absolutely no clue. Only thing we can think is he has been hacked and had his account used for spam. No contact with anyone that could have made him a target, so who knows. He's trying to get his account back as we speak, but I have a sad feeling it's going to take some time. Really sucks..we play together and I'll be missing him on here. Level 54 too.