I have had a run of them go bad, where they lose power but the hotwire still sees and talks to them. It is not the switch, on at least one I found a component on the very bottom of the lower circuit board that separated on one side, and pressing it back on the board to get contact would wake the ESC up.

My conclusion is that chassis slap might be taking a toll on things so I started to address my setup to reduce that as much as I could. Now time will tell. The other possible fix would be if Tekin put a pad in the case like they have with the capacitors to absorb the the g-shock on that heavy component I had come lose, instead of the force being taken in the solder / tabs.