Re: Not just BT
"Fast startup" killed me too, [2 machines on Virgin] and is *probably* root cause of DHCP issue. [Broke my BIOS, couldn't enter it, startup slowed to crawl]
BTW, for other readers, find the option hidden away here, Control Panel\Hardware and Sound\Power Options\System Settings "Turn on fast startup (recommended)"
So Microsoft : Shutdown means Shutdown
oh, I forgot, they obviously won't understand that, how about (IMHO) ...
* Don't disable normal users primary fix method of "turning it off and on again" with a broken, hidden, partial hibernation feature in order to save a few seconds on boot time (perhaps).
* Make it opt in, for those that want it, and obvious what is happening at shutdown and startup time.
* Measure the performance gains/losses for a newly selected "Fast Startuper" and act appropriately.