Intake blockage on hot water heater - shuts off
I have no problem with the ABS.  If you have  a screen in the outlet of the pipe take it out.  You can put it back in as the temperature moderates if you want.  How long is the run and how many elbows?  What is the age of the water heater.  Sounds like you are not getting enough air flow, movement of air is too slow. Too tight of elbows can also cause this problem.