I had a few ads that were disapproved due to an issue with the url (The person that created the ads did not put a trailing / on the url and google did not like them in that format.
I logged into my MCC to edit the URLs and resubmit them but it ended up deleting the ads ???
I didnt notice it sadly as I had the ads filtered t oonly display disapproved. (as I changed the urls they disappeared off of the list)