well, when i took mine apart, it looked like it was wired correctly. i really think its the switch overheating and the magnets, when hot, losing their grip on the connection over to the genset.
i agree with msb68 that water heater, AC, fridge, micro and draw to charge batteries (which is always there and fluctuates) is a possible and quite likely overload. i have never run my water heater on electric since new (we dry camp alot and don't want to have to switch back and forth; recovery on propane is plenty fast enough, and i don't mind burning the propane when we have hookups) so that's not a draw ever. and when going down the road, all i wanted was both house AC's on with the background draw, with the fans on both set on low vs. auto so lower draw. there is no way the genny does not have enough power to do that, based on the specs of the two AC's (and my front AC is the larger 15000 BTU model). if it kept scrambling the transfer switch and popping the front AC breaker, which it did many, many times when hot out, then it's gotta be the transfer switch.
like i said, i put a 50 amp outlet on the end of the genny outbound and problem solved. ran from CT to southwest harbor ME (7 hrs on the road) in 90-95 degree temps with the genset on and both AC's running and never an interruption. problem solved for $10 and 15 minutes of time. only thing is that now, when the genny fires up, there is no lag in power draw. so make sure everything in the coach is off, start the genset, let it warm up for a minute or so, then go plug in, then turn the AC's on. the automatic delay for the genny to come up to speed and warm up for a bit on the transfer switch is nice.....
2014 Georgetown XL 350TS
2014 Jeep Wrangler Rubicon Unlimited
Front & Rear Roadmaster Sway Bars
Front and Rear Sumo Springs Jounce Replacement