passwords keep getting reset.. help?

Anyone know why peoples passwords would keep getting reset and not working? First of all, EVERYONES passwords got reset this morning, no clue why, but I havent been hacked, I'm pretty sure it is a /etc/passwd or /etc/shadow issue. Anyway to get them back? Also, after I reset someones pass it seems to work for a while then klunks out.

Btw, I'm using WHM/CPANEL

edit: just checked /etc/shadow - def has something to do with that.. it keeps replacing the long ecrypted strings with

zeppelin:!!:12745::::::

for example.

 

 

 

 

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