playing bluetooth audio knocks out keyboard

put simply - when i stream audio to my bluetooth audio device (arcam miniblink), often my apple wireless keyboard will disconnect, reconnect, disconnect - repeatedly every few seconds. this happens until i stop playing audio. this problem came up with 10.10.2, then during the 10.10.3 beta it got very bad, and now with the final 10.10.3 it still there intermittently, but somewhat often. at times, i can play audio for quite a long time, then suddenly problem starts happening.

i've tried the pram and SMC resets. no difference at all. is this happening with anyone else? any solutions?