Small problem with authentication

[Mark Jones]

Jan 23 10:32:46 radius freeradius[6262]: rlm_unix: [mjones]: invalid 
password
Jan 23 10:32:46 radius freeradius[6262]: Login incorrect: [mjones/xxxxxx] 
(from client 192.8.137.103 port 0)
Jan 23 10:32:46 radius freeradius[6260]: Login incorrect: [kjrumble/xxxxxx] 
(from client 192.8.136.106 port 0 cli 
ip:64.230.198.9:64.230.196.49:524c:393b:68f7:4f83:108974)
Jan 23 10:32:47 radius freeradius[6261]: rlm_detail: Failed to aquire 
filelock for /usr/local/var/log/radius/radacct/detail-combined, giving up


That is an exccert from our log this morning. Two users were denied access 
even though they supplied the correct username and password. This happens 
all the time exactly a few seconds prior to the filelock error. The file 
lock error is being generated because I use radrelay. I am running version 
1.14.

Any ideas on how I can fix this as denying users access is a big problem.

Thanx in advance.

Mark