I have had almost identical behavior with a completely different wifi
setup. My card is the following:
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless
Network Adapter (rev 32)
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And FWIW, I did try the generic upstream kernel. Exact same behavior.
Also found this: https://askubuntu.com/questions/967355/wifi-unstable-
after-17-10-update/969282#
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Wi-fi would not connect with the latest kernel.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.14 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix t