We had installed 8 units of NP3250 all integrated with AMX controller NI-3000. Out of these 8 units, 3-4 units seem to have problems. Everything seem to work normally but some times, the AMX controller will not be able to turn on the projector, causing the proejctor to hang. We cannot even turn on the projector using the NEC remote control. I have to power off the projector and everything work fine again. There are also incident where the AMX controller could not shut down the projector. We checked with NEC and according to them, no fault was detected. This is an intermittent issues and it is quite difficult to solve. Anyone faces such problem before?