Bug#800721:

I'm having quite similar symptoms on an Intel NUCi3RYH.

Are you also getting

iwlwifi 0000:02:00.0: Microcode SW error detected. Restarting 0x2000000.

in your dmesg output when this happens?

And are you also getting something like

[ 2.329024] iwlwifi 0000:02:00.0: Unsupported splx structure

[ 2.329152] iwlwifi 0000:02:00.0: firmware: failed to load iwlwifi-7265D-13.ucode (-2)

[ 2.329158] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-7265D-13.ucode failed with error -2

[ 2.329175] iwlwifi 0000:02:00.0: firmware: failed to load iwlwifi-7265D-12.ucode (-2)

[ 2.329179] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-7265D-12.ucode failed with error -2

[ 2.329192] iwlwifi 0000:02:00.0: firmware: failed to load iwlwifi-7265D-11.ucode (-2)

[ 2.329196] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-7265D-11.ucode failed with error -2

[ 2.335448] iwlwifi 0000:02:00.0: firmware: direct-loading firmware iwlwifi-7265D-10.ucode

[ 2.335461] iwlwifi 0000:02:00.0: Firmware has old API version, expected v12 through v13, got v10.

[ 2.335467] iwlwifi 0000:02:00.0: New firmware can be obtained from http://www.intellinuxwireless.org/.

on the initial driver startup?

-- Joni Orponen