I have a very similar situation.
My WiFi and BT were working perfectly on Sierra: Handoff, Airdrop, BT keyboard, BT mouse, BT speaker.
But when I did a clean install to High Sierra, BT had issues, while my WiFi worked for both 2.4 & 5GHz the same as before.
But for bluetooth, almost all...
I have gone through it, and I have a very similar situation.
Airport Wifi Bluetooth Network Card For MacBook Air 13" A1466 Mid 2013 Early 2015 BCM94360CS2 802.11AC. Chipset:
My WiFi and BT were working perfectly on Sierra: Handoff, Airdrop, BT keyboard, BT mouse, BT...
I disabled "Wake for Network Access" in Mac System Settings and also in the BIOS of my GA-H170N-WIFI motherboard. I still have this problem. Have to flip the power-off switch on my power strip to disconnect it while it's still off (and prevent the auto reboot).
I had this problem before. I used Clover Configurator and simply checked the box next to "FixShutdown." It worked for some time, but then I was trying to get dual-monitors working and messed something up. Now, even though the "FixShutdown" box is still checked, my hack has started to do the...