RAX120 dropping 5Ghz randomly

I recently purchased 2 of these routers for both of my facilities. Both came ith firmware 24 and automatically upgraded to lates firmware thru the installation to 28. I have been on the phone with Netgear, they tried to downgrade the firmware but for some reason it will keep going back to 28. SO they deiced to install Beta firmware which is still just trash. I keep getting routers crashing both 2.4 and 5 Ghz radios. It will reboot itself roughly every hour. In the mean time you can not access the network for about 5 minutes. I just do not understand how can netgear sell this unit as highened unit and we waste our money. Yesterday I went to Bestbuy they replaced one of the RAX120 I brought it back and installed now the 3rd unit is exactly same problem. Netgear still has no solution. It looks like I have to trash both of these routers and replace them with another brand. DO any of you have recomendation, Bestbuy say ASUS routers are good bu I would appreciate any help since I think Netgear is out of my shop in the next day or so. I wasted now 2 weeks and at least 20 hours of my time.