Running 4.9.0-040900rc6, just had a drop out.  Noticed that dmesg had
this output:

First this line, which seemed to coincide with the dropout:

[ 3627.072802] wlan0: AP 00:07:26:aa:e0:45 changed bandwidth, new config
is 2462 MHz, width 2 (2452/0 MHz)

Then, after a minute, this and it came back:

[ 3707.386740] wlan0: authenticate with 00:07:26:aa:e0:45
[ 3707.394906] wlan0: send auth to 00:07:26:aa:e0:45 (try 1/3)
[ 3707.397243] wlan0: authenticated
[ 3707.397828] wlan0: associate with 00:07:26:aa:e0:45 (try 1/3)
[ 3707.406078] wlan0: RX AssocResp from 00:07:26:aa:e0:45 (capab=0x431 status=0 
aid=1)
[ 3707.413670] wlan0: associated
[ 3707.447412] wlan0: Limiting TX power to 20 (20 - 0) dBm as advertised by 
00:07:26:aa:e0:45


** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1643165

Title:
  Wifi drops out regularly after upgrade to 16.04

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