filesystem mounted as read-only by kernel

I will get an email report from cron daemon:

ERROR: opening '/home/xxxx/public_html/mrtg/rrds/cpu.rrd': Read-only file system at /home/xxxx/public_html/mrtg/upd.pl line 58

checked the filesystem and they are mounted as read-only.
I reboot and all back to normal again. Weird!!!!

Happened twice already in the span of 2 weeks.
Server is centos 4 with cpanel. Could this be mrtg scripts related?

Don't know where to begin to look. Any ideas?

 

 

 

 

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