HD going offline

[Peter]

Hi all,
I have a PE 1500 with Perc3 DC (128mb) Raid Controller and 2 36GB HD  
in a Raid 1 configuration. Since about 2 weeks both 2 HD will go  
offline without any known reason. I only can boot the server again if  
I go in to the Perc3 setup and force the HD back online. Sometimes it  
will be ok for a couple days, sometimes just for a couple of hours.  
There is nothing in /var/log/messages that would indicate any problem  
with the HD which makes me think it is a problem with the Perc3  
controller. I do have another controller coming in a couple days but  
was wondering if it is something that can be fixed?
I would be thankful for any tips, hints or ideas.

Peter M.