I'll type the standard FAN BOIS response I got when I complained here...
"It's all your fault for not doing a clean install."
Ironically, if you try to report this bug using Feedback Assistant, that program will drop your WIFI too! HAHA!
There are many alternatives though. You could plug an iPhone into your Yosemite Mac with an unsupported Apple accessory cord. That will drop and reset your Bluetooth, then you can re-boot and lose all your work for the day and everything is fine.
As a last resort, drop Mac in a salt water bath while plugged in. 😀
Honestly, considering how many times I reported these issues, I feel like Apple wasted my time testing their "Beta" since they fixed NOTHING I reported.
Oh, Yosemite also still boots to an HDTV across the room that I have to turn on. Also not fixed. None of these things were issues in Mavericks.