My HB 859DI froze then faded to white on engine start-up this morning. Voltage was 12.8. Tried to reboot but buttons didn't work. Pulled the power plug and rebooted. Worked fine for two minutes then froze again. I have rebooted several times and the longest it's stayed running is 15 minutes on simulator mode. Plugged into the charger as I type and still won't stay on. Voltage is 13.2. Cleaned all connectors and replaced 3 amp fuse. Have a tournament in two weeks and need to get this resolved. Any ideas?