I can confirm that this is still an issue with the MS70 versions of the Nighthawk

This is an old topic though I can confirm that this is still an issue with the MS70 versions of the Nighthawk.  Thankfully I found this thread as my satellites kept randomly disconnecting and my Echo Dots would not combine for whole home sound saying they were not on the same network.  Taking the advice of, Gamerack I raced home from work as my wife was having issues with calls dropping and works from home, so these drops are not acceptable.  I went into Advanced setting on my router and then LAN settings, found each of the satellites, set DHCP to end at 1.100, then set each satellite to a static IP with a reservation above 1.100.  I also did a scan of the wifi signals and channels and did some testing finally settling on 5ghz channel 108 as stable and available.   I then did reservations with a number of devices around the home, and also set my PCs NIC, which is directly connected to one satellite,  to 2.5GB Full Duplex instead of auto negotiate, and received much better speeds.  I ran my game all night and was no longer disconnecting. My wife will be working throughout the day with a number of meetings.