To clarify, the thunderbolt port is only used when needed. I use it to connect to the dock I cited earlier, which enables use of my supplemental monitors.
Right now, as an example, I'm using the machine with nothing plugged into it.
Thunderbolt may have been a complete coincidence (or, maybe not). Although, my brother has the exact same laptop, dock, and monitor setup at the office, and has not has any issues (FWIW).
To your point on sending this machine off of a cliff, I am getting close, although I'm still within the warranty window and warranty was extended by 90 days post display replacement. You run Asus machines yourself and I've had good experience with them over the years, also. Maybe I just have a lemon. Before spending more money, I would try to have Asus do something to rectify ... Even if the worst case scenario holds true, my hope is that we're able to narrow in on a possible root cause before I go back into Asus Canada and blindly spray or worse, waste my time.
Remember, aside from some DropBox weirdness, things were working fine after the help you gents gave me a few months ago (I just engineered a car through the 24h of Daytona without issue). It is more likely that whatever is going on is related to the Uber driver dropping the thing and the subsequent Asus repair... But, as you can imagine, they weren't exactly the most competent bunch (you guys dummy them), so I feel I need to provide them some direction when/if I go back.