Logfile not accessible

Hi,

Lately I've been having a problem with one log file, it goes from green to yellow almost every 3 to 5 minutes.

I'll get 'Logfile not accessible'. The logfile is in '/opt/mysql/log-error/xxxxxx-error.log'

It exists, it has 777 permissions, it is constantly being written too, it is only 52 mgs.

I have restarted xymon-client on the server.

Here is the rest of the error: Full log /opt/mysql/log-error/xxxxxx-error.log Cannot open logfile /opt/mysql/log-error/xxxxxx-error.log : No such file or directory

Here is the 'ls' command on it.

-rwxrwxrwx 1 mysql mysql 54394406 Jan 7 16:23 /opt/mysql/log-error/xxxxxx-error.log

Thanks in advance.