Not sure what happened. Perhaps we can make some guesses though, his last post (at least, the last one that hasn’t been deleted) is from 2016. Quite a while, really. I wasn’t aware until I tried to track down his annual prediction thread, to which he generally pinged me.
http://www.freerepublic.com/tag/by:perdogg/index?tab=comments;brevity=full;options=no-change