Yes.. We do use the singleuser mode in the read only enviroment.. I will check the texis.cnf settings and try that if the atime change doesn't help.
So it seems that the noatime was the culprit. I turned it back on and the problem went away. The servers have been rock steady since the 12th.
There is a new error in the monitor.log. Do I need be concerned with this?
000 Apr 17 02:11:12 (17133) Unable to remove semaphore: Operation not permitted in the function Clear semaphore