Rax80 smart connect issue wifi dropping

Well Friends, there is an issue with these routers from either a Hardware standpoint, or in my opinion a Firmware issue. I tried my first RAX 35, wired and wireless speeds were fantastic, but starting day 2 wired and wireless devices across both frequencies were lost. Attempted channel transmission changes at Netgear supports urgence, on both 2.4 & 5 GHz, as well as well as lowering MTU to 1492 from 1500.... No change. I Just received a replacement direct from Netgear yesterday ( original ordered from Walmart on Black Friday, hence the purchase, half price ) the new one is doing the same thing, same issues. Once a day, internet is lost. Strangely it remained today on two devices running 2.4 GHz wifi, as well as several security cams on same freq.... but hardwired D.T. no joy. ( a variable I experianced on the first router as well)  Now I didnt retain the original firmware that came on the unit, ver. (V1.0.2.48_1.0.1)I upgraded to the only available Firmware available  V1.0.3.62_1.0.1.... and problems are back.... wish I would've used the original just to test..... Im gonna give this a few more days, hoping maybe the techs will release a new firmware to resolve this.... if not Im going back to my old Asus AC 68u workhorse... Im an IT professional, so Im not a layman on these matters, but the last thing I want is calls during the day from the Mrs. about wifi being down, or having to trouble shoot networking issues when I get home. A power cycle of the router resolves the issue, but again its replicating daily. Has Anyone not upgraded the factory shipped firmware using these routers? And possibly not had these issues?? As a side note, Ive just replaced my modem with a DOCSIS 3.1 thinking that was the original culprit.... wrong. Arrrrrrgh!!