Nighthawk AX5400 won't keep my devices connected

I regret the day I bought this terrible piece of equipment.  It will not keep my devices online.  It randomly boots devices all day long.  NOTHING WORSE THAN FAULTY EQUIPMENT - NOPE - CUSTOMER SERVICE is literally the WORST  experience I have ever had.  I am 7 hours into being transferred from one untrained service person to the other.  Every one of them tells me the next one will get me a replacement device.

HERE IS HOW THIS IS GOING DOWN:

1. I take it back.

2. I charge it back on my credit card if the store won't take the crap back.

3. NEVER NEVER AGAIN should you buy from this company.