After 600 trouble free hours with the VM 1000 in my -8A, I installed their upgraded software chip in the DPU. Since then I have twice experienced a test pattern lockup where the display goes into a test pattern that illuminates every LCD segment and it stays that way. Cycling power does not solve it. The first time this happened, VM gave me some suggestions to troubleshoot but when I tuned it on again a day later, the system worked. It failed again yesterday but before I call them I wanted to find if anyone else has had this occur, either before or after the new software EPROM was installed.