I also faced the same fate as others as my device start restarting when playing pubg and it got so much hot i got panicked when seeing the posts to change motherboard. But after resting i done all the stress and benchmark test using Antutu benchmark app and i passed with no problem. I don't know really my device is good but for now no problem.
I don't know why it's called a stress test: D whether stress for a phone with a full load or stress for the owner: D the load temperature reached 95 degrees, but dropped back to 35 immediately after the test
The motherboard issue is a hardware problem, not a software one. The users with affected devices would have experienced the issue eventually, that particular software update just coaxed out the issue earlier. This is why we are encouraging users worried about their phones to run a stress test. Future firmware updates will not trigger the "restart issue".