If you are receiving no PM, this indicates that the entire thread has been trashed. The moderators have been extra strict lately about spam, threads that don't belong or should be locked. Many threads are disappearing, being moved or locked at a rapid pace these days. It is spring-cleaning time.
A lot of your posts are 100th+ reply in a thread, these type of threads regularly get removed for encouraging people to spam responses that add nothing.
Mostly , the common reason why your post deleted is because your comment is out of the topics. Or maybe because you already post in that topic and you have a duplicate answer in that. So they deleted it .