/tmp directory disappearing

[filePro List]

Hi all,
I have three customers using SCO Openserver 7 and filePro which are 
finding the /tmp directory completely deleted at random times.  One uses 
MOS, the other two have different filePro apps.  This just started in 
2015 and happens randomly.  I checked the crontabs and /etc/rc2.d for 
scripts that may be causing this.  I am totally perplexed.  Anyone else 
having this problem?
Thanks in advance,
Larry Hoover