A couple of dynamics may be at work here. My genset is seems fuel-starved at the end of a day's drive...even though the fuel tank has not been less than 1/2 full. I've assumed that the problem is a small slug of air in the genset fuel line, and once that's cleared (the genset dies at about 45 -to- 90 seconds of running), it will start and run without further stalling.
The other dynamic? You've probably observed that the genset, once started, does not immediately supply power to your rig. There is a delay (25 seconds or so?) before the transfer switch actually throws and the genset is now loaded with whatever is turned "on" in the RV. Sometimes what is "on" presents a real jolt of load....such as a combination of hot-water-heater power and/or other AC -powered devices. Because the genset is not fully warmed up yet, this "jolt" may be of such magnitude that the ECM cannot recover from it, and the genset stalls. But once warmed up, all is OK.
Have you observed any of this? I personally have just chalked this up to "it ain't new anymore."
Robi & Dale ---- Go Navy ----
2016 Winnie TOUR 42'
Tow: '19 Buick Envision
or: '08 Buick Lucerne