Failure to automatically reconnect after drop - requiring manual reconnect, only successful after second try

[fargoth]

Using Ubuntu 17.04 (64 bit)
Package version 1.4.4-1ubuntu3.1

This happened to me 3 times today:

The connection drops and is not automatically restored, even though the network is visible in the nm-applet.

Manually clicking on the network to connect, results in an animation of the nm-applet showing it's trying, but it gives up after a while and changes the icon to up\down arrows instead of the wifi sign.

Clicking on it again, and selecting my network again, results in an almost instant reconnection, which implies that the computer should have known to do it automatically instead of requiring me to tell it to connect again (let alone twice).

Here is the journal from a system startup:

https://pastebin.com/hGrFEWiU

And here is the journal from one such unsuccessful reconnect.
I've added (*** comments ***) to mark where I've manually tried to reconnect (twice, second time successfully):

https://pastebin.com/TAyt6McQ

[fargoth (cantfind)]

More system information:

lspci -vn gives:

05:00.0 0280: 8086:24f3 (rev 3a)
 Subsystem: 8086:1010
 Flags: bus master, fast devsel, latency 0, IRQ 142
 Memory at df100000 (64-bit, non-prefetchable) [size=8K]
 Capabilities: [c8] Power Management version 3
 Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
 Capabilities: [40] Express Endpoint, MSI 00
 Capabilities: [100] Advanced Error Reporting
 Capabilities: [140] Device Serial Number e4-a7-a0-ff-ff-a3-07-c8
 Capabilities: [14c] Latency Tolerance Reporting
 Capabilities: [154] L1 PM Substates
 Kernel driver in use: iwlwifi
 Kernel modules: iwlwifi

Also attached wpa_supplicant log (although I set the log level to debug too late for this time).
Notice that wpa_supplicant stops doing group rekeying about 15 minutes before the network disconnected (around 11:25), and all the messages from 13:57 and on are from the 2 reconnection attempts. It seems there was no automatic attempt at reconnection that reached wpa_supplicant.

[fargoth (cantfind)]

I can induce a connection drop by changing the wireless channel on my router - this also produces a similar result (no auto reconnect) - it shows like it's trying for a minute or 2, and than shows the up/down arrows. Selecting the network manually connects immediately.

Here's the NetworkManager log: https://pastebin.com/CB6d8NP4

Attached is the debug wpa_supplicant log starting from the disconnect