Brake Light On problems of the 2016 GMC Sierra 1500

Brake assist light came on and I had no brakes when I pushed the pedal harder brakes tried to lock up I almost wrecked.

At low speeds the brakes get very hard to press and the truck takes longer to stop. The service brake light has came on sometimes when this occurs. I've seen an open recall for the exact problem with my truck, but when I enter my VIN it says my truck is not part of the recalled vehicles. Please help me.

I bought this vehicle in July of 2019 from a GMC dealership in duncansville PA. In late November on my way to work randomly my service stabili trak, abs, assisted steering, and brake light lit up on my dash every 30 seconds repetitively for the remainder of the trip (3 hours). I work 4 hours from home for 2 weeks at a time I spend very little time in my vehicle during this time. I seen the lights come up randomly while out of town also. Once my work weeks were over on my way home the problem persisted. I took it for an oil change and recall late December. They told me they could not replicate any lights nor were they showing any codes. As of last month the problem is getting worse to the point were I am completely losing my power steering sometimes for days at a time. Last week I took my vehicle down for another recall sent from gm specifically for my VIN I was told there wasn't any issues or codes. All they could find is a communications error and they would need to keep it for a few days and sent me on my way home until they had a loaner vehicle available. One week later after several attempts to get my truck in I still have a lit up dash, no power steering, and not a clue when it'll even be able to be looked at since I leave for work in 2 days. This is a common problem from what I have read and can be extremely dangerous especially in winter/snow/icy conditions. I need a vehicle that I can feel safe in that I can travel without worrying around every turn if my power steering is going to shut off and I'm going to have to power a vehicle around a turn or to avoid an accident. I feel like my problem is being brushed under the rug. On my way home that day just 2 miles from my house my power steering went out and I slid off the road fortunately I live in the country and nothing was in the field I slid into. I have photos and videos of the lights flashing off and on.