I seem to have exactly the same problem, I will outline my system:
PXI-1044 14 slot backplane & housing PXI-8184 CPU with RT embedded software (no dual boot) PXI-6225 etc. various M series DAQ cards (3 in total) Dedicated Ethernet section to DHCP server and PC with LabView
System worked in the lab, we then deployed the PXI box to the place where it is to be used and now it is dead. Investigating with a monitor on the VGA port, it starts OK, gets an IP address and says 'Welcome to LabView Real-Time 8.5'. It then starts a load monitor on the top line of the screen. All is well for maybe 5 seconds then a message comes up 'Rebooting due to exception 0xC0000005'.
It then re-boots and again gets an IP address. This is followed by 2 messages 'Reboot due to system error.' and 'Systems status: Safe Mode (Software Error). It stays like this until I cycle the power or press the reset button, it is sort-of seen in MAX but without any IO
Richard is currently in contact with myself at NIUK Applications Engineering to troubleshoot the controller issues further, thanks for your response to the forum and when a solution is found it will be posted here for the community.
Yes, re-installation of the RT target was indeed the cure. It seems the flash disc had become corrupt, with help from UK support (Rob) I was eventually able to re-install it and all seems well.
Re-installation though had to start by upgrading the host PC to Labview 8.5.1 before doing the same to the RT target via the MAX application. Only to discover that the included DAQ-mx driver 8.7.1f2 has a bug that stops the PC from playing with the target (thanks again to Rob). So I had then to download and install DAQ-mx 8.7.1f3 on the PC, re-boot it yet again (no thanks to Bill G for such a lousy OS) before feeding the driver to the target. Finally it all seems OK!