My wifi will work fine for a while, but every 2 hours or so my connections drops. The wifi icon in the taskbar states that I am connected to the network, but I can't access the internet. Rebooting fixes the issue, though when I reboot ubuntu gets stuck on a refreshing splash screen, unless I hold down the power key. This happens only once the wifi stops working, so they must be related. I tried sudo service network-manager stop and sudo service network-manager start, but then everything becomes really laggy and I have to hard reset anyway. I am using Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter on Ubuntu 15.10. If you suggest things to troubleshoot, I can wait for the next time it happens and post the output here.
EDIT: My question is not a duplicate of Qualcom atheros wirelless adapter not recognized in my acer v nitro laptop because my adapter is recognized just fine, my speed is find. My issue is that the connection drops every 2 hours and I have to hard reset the laptop to fix it.
However, running dmesg | grep ath as suggested there gives the following errors:
[ 7.048851] ath10k_pci 0000:03:00.0: Direct firmware load for ath10k/cal-pci-0000:03:00.0.bin failed with error -2
[ 7.049078] ath10k_pci 0000:03:00.0: Direct firmware load for ath10k/QCA6174/hw2.1/board-pci-168c:003e:11ad:0804.bin failed with error -2
[ 7.049081] ath10k_pci 0000:03:00.0: failed to load spec board file, falling back to generic: -2
