C6300 T3 Timeout -- Followed by Wireless Channel Set to 0

Hi!  I have a Netgear C6300 (Firmware Version 2.01.14).

Problem Overview:

Frequent T3 timeout errors, followed by wireless channels turning off.  Only can be fixed with hard reset.

Within the last 2 months, I have been getting daily T3 Timeout errors (often 2-3x daily).  That part is not necessarily a problem, since it seems like a temporary loss of internet, which comes back in a few minutes.

The real problem is that following the T3 timeout error, the wireless channels on my C6300 are set to "0."  In the menu, it is clear that they are set to real values (i.e. channel 02 for 2.4ghz and channel 153 for 5ghz).  But "Current Channel" is shown to be 0.  Applying settings, changing channels and applying settings, nothing will change the current channel from 0.  The result is no wireless internet until I hard reset the entire system (wired connections still work).

Full(ish) Overview

(1) my internet connection will drop 1-3x times per day

(2) with each drop, there is the exact same event log:

(3) the T3 timeout error seems to be temporary.  by the time I walk upstairs to the C6300, plug a laptop in via ethernet cord, the internet is back and fully working.  so the wired connection works fine, even moments after the T3 timeout error

(4) from what I understand, the T3 timeout error is likely an upstream problem.  either from my ISP (TWC, so not unlikely because they are mediocre at best), or from a bad cable.  my router is connected about 6ft from where the cable enters my home, directly into my C6300.  no splitters, no bad cables, no bad connection, just a direct connect.  so i doubt the problem is there.  however, the cable is hung from the next house, so it is possibile a squirrel is chewing on it, or whatever.  i am trying to get TWC out to inspect the cable, but it has been a difficult process.

(5) nevertheless, the T3 timeout error seems temporary and sporadic.  the problem i am trying to solve occurs AFTER the T3 timeout error

(6) after the T3 timeout error, the wireless on the C6300 no longer works.  (again, the wired connection works fine). wifi networks no longers appear on ANY of my devices.

(7) when opening up the wireless menu, I see that both 2.4ghz and 5ghz channels display "current channel: 0."

(8) the wireless channels are still set to their defaults, but again, the current channel still displays "0." 

i.e. 2.4ghz -- Channel: 1 -- Current: 0

i.e. 5ghz -- Channel 149 -- Current 0

(9) applying changes to lock in the proper channel change nothing.  changing the channel settings (Auto, 02, 03, 04, etc) and applying those changes, also change nothing.

(10) the only way to restore wireless internet is a hard reset.  sometimes two hard resets.

(11) one obvious fix, is to track down the upstream problem causing the T3 timeout.  in the meantime (because that could take a long time, or possibly never happen.  living in NYC makes service and tracking down problems VERY difficult) ... is there a way to fix this wireless problem?  i may be wrong, but in my mind, it should be possible (and MUCH more livable) to have brief T3 timeout errors, get internet back, and keep my wireless settings.  in that world, i may lose internet for a few minutes each day, but then it will come back!

often i am away at work when the error occurs, and i would never know about it ... except that i come home and i have no wifi, have to march upstairs, unplug and replug in my C6300.