Alternator/generator/regulator problems of the 2013 Chevrolet Tahoe

My wife and I bought a vehicle from cardenas superstore in pharr, TX. We've been to them 4 times, in which they've sent our Tahoe to the local gm/Chevrolet dealer in our area. Generally, when the weather is warm, stabilitrak and traction control will disable and we will see a series of warning lights. The abs warning light will go off, the air conditioner temperature will rise to a warm temp, the locks will start unlocking and locking randomly, hard transmission jerks between first and second gear, and little power when trying to increase speed. The first time we went, they said they couldn't find a problem. The second time we went, they clean out all the fuel modules, the third time they couldn't find anything wrong. And finally, on the fourth try, the dealer couldn't find any issues so they put di-electric grease on some of the wiring. Two days later it started acting up again. A reason they may have trouble finding any issues is that after the vehicle is off for some time, it will start up and run without any issue. I've managed to get it over to the local autozone while all the panel was going off, and power loss, and they mentioned a few possible issues. The vehicles voltage regulator may be bad, as well as loss of communcation from the ecm and many sensors(fuel pump, transmission, etc. . . ). We are lucky that we bought an extended warranty on the vehicle or this could have become very costly for us. But none the less, safety is of a concern when driving the Tahoe. Any guidance will be greatly appreciated. -robert neeley.