Nighthawk R7000 Connection Issues

I want to start with a little backstory...I first purchased this Nighthawk router in August of 2017 and used it for approximately 20 months with no issues whatsoever. It would stay connected/online for months at a time, and the only time it would disconnect is when I would do a periodic reboot from the app as I've seen recommended on several different discussion boards. For the next several months, the router would have all of the lights turn off, and the power light would go red, and would require me manually unplugging the modem and router and replugging them back in for the system to start up again. Initially, I called out our ISP (WOW) to check our internet line to the house, and they were able to determine that there were no issues with the connection to the house and modem, which allowed me to narrow the issue down to this router. I looked at other netgear forums and tried recommended solutions such as plugging the router into a different power outlet, factory reset etc. I was running the latest available firmware, and even went back to a previous firmware (and was subsequently prompted in the nighthawk app to re-update to the latest firmware). After unsuccessfully resolving the issues, I fortunately remembered that I had geeksquad protection for about another month, and was able to return that Nighthawk R7000 and replace it with an identical model. I have had the replacement for just under a month, and am still experiencing connection issues. All of the lights on the router remain on and white, but my devices will disconnect, and I have to reboot the router from the nighthawk app for the connection to my devices to return without issue. This will work for several hours, and then the connection will drop again, and I will have to go through the reboot process again, etc. 

A few notes:

-When the connection is working, my internet speed is phenomenal (250-300mb/s down, 50-60 mb/s up)

-We do not have cable, so we stream everything from HULU w/ live tv (as you can imagine, trying to stream with a connection that is constantly dropping is quite frustrating)

-There are usually 15-20 devices connected to the network at a time (split between 2.4Ghz and 5Ghz)-This is about the same amount of devices connected to the first nighthawk that I had during the first 20 months when I had no issues, so I dont believe that this would be the problem

-We have several google home devices connnected to the network (2 chromecasts, 3 google home minis, 1 google home hub/nest hub). The minis and hub are connected to 2.4Ghz, while the chromecasts are connected to 5Ghz. I read in a discussion post dated several years ago that the "cast" feature of google home devices was sending large packets to routers and causing them to disconnnect (If I understood the post right), but I was under the impression that google has since put out software updates to resolve this issue, so I dont know if that would be relevant to the current issues I am experiencing.

I consider myself moderately tech-savvy, but have definitely met my match with the issues I have been experiencing. Any suggestions/ideas on how to determine if a certain device is crashing my network connection would be greatly appreciated.