[ValueAddedRS]

Same thing happened to me a few months ago and it was 100% automated systems flagging in error.

If you contact support they will likely tell you it happened for...reasons...but they can't share any details because then the bad guys could find out how to get around their super-duper AI security system so, sorry this is just where we part ways, no way to appeal.

I was finally able to get my account reinstated, but eBay admitted to me in writing that normally those kinds of suspensions are permanent/not able to be appealed and the only reason they lifted it was because of my "social presence" after I made some noise on Twitter (and tagged some high enough up the eBay corporate ladder accounts in the process).