Learned something new....Had a client turn off the main power switch while the engine was running. The next time he went out the FlyFocus unit wasn't working. He investigated and found the board in back had an issue. If the engine is running, always shut that down first.
In order to try and figure out how this happened to try and prevent future incidents, I asked Igor more questions and after more thought this is what he thinks happened:
He believes after he started up FlyFocus and the engine when he was putting on his seat belt he remembered reaching up to get the right side harness on he recalls hitting the safety string/rope to the on switch and that caused the power switch to go into the off position. Keep this in mind when putting on your safety harness. I might consider moving the safety string/rope to above the switch but for me attending shows it needs to be removable easily, will give it some thought.