I've seen many so many of these issues related to the Tuff A15 and A17 (which I have). I'm a computer tech and have exhausted my 30+ years experience trying to resolve these issues. I finally gave up and bought another laptop.
I'm fairly convinced these issues are arising from poor engineering and maybe poorly written drivers.
In all my years, I've never met such a buggy computer that resists every effort to fix the faults. I'm thinking there could be a class action law suite in this. This laptop has no stability.
I also have over a decade long experience with computer tech and I can't recall a problem I wasn't able to fix after exhausting all possible options. As you said it's a result of poor engineering. Asus really **** up here. But unfortunately I don't think there are enough users of these laptops to reach class action level suite. All I take from this is to avoid Asus from here on out. They used to be top notch, but guess time has taken its toll on them.