Comment 80 for bug 1520343

Dell XPS 13 9360 (Kaby lake) using Ubuntu 16.04, kernel 4.4.0-53.
Connection drops randomly, while iwconfig and network manager showing as still connected. Disconnecting and reconnecting to the network resolves the problem. Have tried changing wifi-powersave in /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf to '2' instead of '3', but the problem still persists.

lspci shows
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32)

log shows
Dec 11 20:43:24 ******-XPS-13-9360 kernel: [ 9.182099] ath10k_pci 0000:3a:00.0: Direct firmware load for ath10k/cal-pci-0000:3a:00.0.bin failed with error -2
Dec 11 20:43:24 ******-XPS-13-9360 kernel: [ 9.182331] ath10k_pci 0000:3a:00.0: Direct firmware load for ath10k/QCA6174/hw3.0/firmware-5.bin failed with error -2
Dec 11 20:43:24 ******-XPS-13-9360 kernel: [ 9.182334] ath10k_pci 0000:3a:00.0: could not fetch firmware file 'ath10k/QCA6174/hw3.0/firmware-5.bin': -2