Random Zaptel Card Not Found

I am having a problem that every now and then my TDM400P card is not found. I do not know if perhaps its the card or something else, I even tried rebuilding this test server/install and it found everything just fine and a reboot later is not found?

System hardware is a dual Intel Xeon 2Ghz, 4GB DDR2 400Mhz, 150GB SCSI320 RAID 5, with 10/100 NIC. Software is running CentOS 5.3 i386 with all current updates. The card when it was first found, came up as WCTDM/0 “Wildcard TDM400P REV I Board 1” Master

Perhaps its just too old of a card to run on Asterisk 1.5+ ?