EAD Ovation 8 Pre-amp HELP

My EAD Ovation 8 has a problem. Anyone that knows where to fix please provide information or Help with repair. The unit has an intermitten problem that sometimes makes a popping noise through the speakers and sometimes the screen freezes and wont allow the remote to comuunicate. This usually occurs after a few hours of operation and most of the time by turning the master on/off switch in the rear to the off position for a few seconds the unit works again for a short period of time. Please provide me with any and all information that may lead to the repair of the unit including EAD's phone # or any Technicians that may still repair these great units. Any info will be greatly appreciated.
Thank You Very Much!
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