QD800HDK - Overvoltage

[memphis02]

Hey everyone, last two times out, I've gotten an AC Overvoltage fault on my genset and it shuts itself down (I have no issues restarting it and getting power afterwards). The first time it happened was within 10 minutes of starting it and transferring the load of both A/Cs, second time was the same day, a few hours later of normal operation while underway. The second time I got this, I was already underway and had ran the genset for several hours problem-free with both A/Cs going. This, most-recent time, I could swear I heard the generator over-revving. Genset is regularly exercised/maintenanced and has just shy of 600 hrs. Just out of curiosity, today, I ran it for 4.5 hours problem free on a 200 mi trip with one A/C off and had no issue. Rig is stored inside and all occurrences have been in dry 70-85 degree weather. -My cursory research is point me in both mechanical issues and electrical. -Just curious if anyone had this error and have dealt with it before?