R7000 2.4Ghz & 5Ghz slowdown

Update:

When trying to troubleshoot and change channels yesterday morning... I swear that the Router login page only offered me channels 36 -40 - 44 - 48. I had tried all of them .....and offered no improvement ( from 160Mbs down to 10Mbs or something equally ridiculous).

I then updated to the latest firmware and instantly back to 160Mbs. Through the day - still strong at 160Mbs (ish) at various intervals. I checked and the channel was in the low 40's I believe.

I have 1 nieghbour using the 5Ghz band.... as I discovered.....on channel 44. So surely this would be the cause of the conflict? But why then does a factory reset or firmaware update immediately bump it back up to 160Mhz and then only first thing the next morning, it drops back to under 10Mbs? Other than my Galaxy s4 phone - no other device in the house uses the 5Ghz band.

So - via my phone this morning I access the Genie app and to my surprise, in the 5Ghz settings - a whole load of other channels. I set it to 112. Rebooted and back strong at 160Mbs ( where as before other reboots in the lower 40's made no difference).

A turn up for the books ?  Hopefully. So I am either going senile way too early or the last firmware update added these previously....err...uhm.. 'missing channels'..... but they are now in the router login console....clear as day.

I can also access files and play videos off my USB drive connected to the Nighthawk....upstairs ....going through 3, 120 year old solid Victorian brick walls....  as if the drive was locally attached. So this Nighthawk (cross fingers) kicks some major butt!

So - TheEther - thank you again for your kind advice - lets hope this badboy settles down now..