Cruise Control problems of the 2015 GMC Yukon

Just got this vehicle 2 months ago. Brake lights seem to work when the want to. Have read others reviews and seems everyone with this vehicle is having the same issue! the cruise control works when it wants too,. Check engine light is off and on had it checked once while on and was told it's an O2 sensor. When the check engine light is on remote start won't work. Seems the brake light issue is purposeful since so many people have the same issue and it costs so dang much to fix it! for such a nice vehicle and expensive payment you would think there would be no issues.

I put in another complaint and forgot to add maybe the most important details!!!! I have noticed my cruise control, check engine light, brake lights, and remote start though I'm having issues with them all working only when they want to it seems when it's hot outside all of these things go hay wire and when it's freezing cold (colorado winter) everything works fine. Today high of 40 everything is working fine. . . Highs in the 80+ everything seems to not work. So it's basically boiling down to electrical issues when it's hot and no issues when it's freezing cold. Can someone please fix this!!!! I've seen numerous complaints of others having the same issues with heat and electrical issues. (cargurus. Com) please someone do something gm needs to fix this!!!!!!!! I only hope others have made these complaints so gm can be held responsible! 800$ for a brake light get out of here!!!!!!!! and that's just the price to fix the brake light when it decides not to work and I'm not paying that much to fix one issue when it seems to be something with this vehicle and heat!.