The problem with generators is that they are not always consistant in their output frequency and these controller systems are not all that tolerant of frequency shift. Many of the higher output and even small low cost units depend on generator RPM to set the frequency so if the governor is not set to the correct RPM or the engine does not have enough HP to carry the load, the frequency of the gen will shift off of 60 HZ and possibly enough to confuse the controllers. The one thing that I would suggest is to not vary the load on the generator to much (smaller show or use LED's) or you will get some frequency shift. One thing that would probably work if your generator is having a hard time would be to use a high quality high output UPS along with that generator. These UPS's have their own frequency control and will correct for the generator if it is off or varying to much due to changing load, lack of HP, or a bad governor.