known vncserver issues?

Hi, Does anyone know of OS stability issues related to vncserver for SLES 8? My opteron server has crashes a couple of times. Each time I was using vncserver and connecting with vncviewer (from RH 9 systems using tight compression). I'm trying to figure out if this is a hardware or software problem. The OS is up-to-date and the hardware is: Polywell 2200A Dual Opteron ATX MB w/VGA,SATA,2LAN 2xAMD Opteron Processor Model 244 (64bit-1.8GHz) 8xDDR 333MHz 512M SDRAM PC2700 Memory ECC/Register 460W Power Supply for Dual CPU 2xWD 250GB Ultra-100 IDE 7200RPM 8MB HD 3Ware 7000-2 Port IDE RAID Controller In any case, a service person will check out the machine in 24 hours.... Cheers, Jas.