I don't have problems with BT connections dropping. I use a K810 keyboard, Razor Orochi mouse and Halo Jabra 2 headset all the time.
The BT problem I do have is that sometimes when I boot from complete shutdown, the keyboard and mouse are not detected//working.
I have to login using the onscreen keyboard or typecover.
Even once logged in, if I leave it for a few minutes, the keyboard and mouse don't connect, even if I turn them off and on.
If I reboot, then the mouse and keyboard will work on the login screen and stay connected - no need to repair them, so it's something with the BT adaptor not always starting correctly.
This only happens sometimes.
The headset hasn't had any problems, but I always just turn it on at some stage after boot up. It always connects very fast and stays connected.