Specs: Dell XPS 15 9550, Ubuntu 16.04
Kernel 4.5.2 worked great for me.
After upgrading to kernel 4.5.3, my WIFI is spotty at best. It was instantly noticeable.
Many times, it's like my network adapters' drivers aren't being loaded. I need to reboot a few times.
Looks like other people might be experiencing similar problems with kernel 4.6.RCx
It is strange that sometimes the drivers will load fine for me.
lspci -nnk | grep 0280 -A2 02:00.0 Network controller : Broadcom Corporation BCM43602 802.11ac Wireless LAN SoC [14e4:43ba] (rev 01) Subsystem: Dell BCM43602 802.11ac Wireless LAN SoC [1028:0024] Kernel driver in use: brcmfmac
EDIT: This is fixed in kernel 4.6