R8000P dropping wifi connection

I only wish I could help, but I'm having similar issues.  Do you have an external drive attached to the router's USB port?  My R8000P is very unstable, and recently, after a relatively good day, I attempted to use SyncToy to copy files to the attached USB drive, and, maybe coincidentally, I could no longer connect wirelessly to the router nor access the internet with my wired computer.  I could no longer access the router's web page, either.  Inspection of the router seemed to show activity, but nothing was accessible.  It's gotten so bad that I have the router on a digital timer to shut it down (hard reboot) for a minute each night.  Also, although accessing the drive seems to have caused the meltdown this time, it's not consistent; many times the router becomes inaccessible for no reason whatsoever, besides actually expecting for it to do its job and get me on the internet.  Hopefully, someone else in the community, or Netgear themselves, have some idea what's causing our issues.