Installed a system yesterday that has a Hitachi 37PD7800TA plasma driven from the Monitor Output (Component) from an Integra DTR-6.5. Source components are a Integra DPS-6.5 & an LG-ST4100 HD STB. Everything was working fine until for no apparent reason the plasma started having picture sync issues (not locking on). I switched the system off, then on again and the system worked again. This pattern happened a few times on both DVD and HDTV. Anyone else had any similar issues with Hitachi plasma's? Any method of resolving this?
TIA

P.S. - I'm pointing the finger at the plasma as this is our 'everyday' install system, but normally with a Fujitsu plasma.(Customer already had Hitachi)