Filemanager disappeared

I use a filemanager on my server on DH. Over the last couple of months, it has completely disappeared several times. I’ve checked with the creator of the filemanager, and it is in use on many websites across the internet and none of the other sites have this problem. Further, the permissions on the folders and sub-folders would not permit it to self-destruct and erase itself.

Anyone else have this problem? Or solutions?