I have a customer with a 16.4.2 (non AI) which is experiencing a very bad glitch. At times the board with send a major glitch into the system and shut down all outputs. The board remains on but the glitch kills any and all audio throughput. The only resolution is to reboot the system. After the last spike, the system has failed to come back. Has anyone experienced this with other 16.4.2 mixers. I apologize but I do know the current firmware version on the board.