accounts disappears!

hello Freeradius, well, Its a strange problem, However i'm on FreeBSD 6.1R, Freeradius, Chillispot, mysql and i use myprepaid php for account interface. This system is up and running since september 2006, last week, we start to see a strange problem some account are disappearing from the system!! few customers are complaining that they cannot login anymore, when we check.. we donot find an account for this user anymore...it happend for like 4 or 5 accounts now!! Any resnable reason for this?? Marwan Sultan System Administrator _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/