Bluetooth sound + rear windshield wiper = random BLARING sound, Sometimes when I flash my high beams as well Options

[Jeebus]

I installed a Kenwood KDC-BT858U deck this past summer and use the bluetooth on it along with my Galaxy S3 to play music. I first noticed the symptoms when I flashed my high-beams, and it occurred randomly when I flashed. The sound would be normal, and when I flashed, sometimes it would stay normal, sometimes it would BLARE the volume to the point of distortion. Now that it's pretty much winter season here (rain for 6 months), I've been using my rear wipers more, and I figured out tonight that when my rear wipers are on auto, the sound will blare randomly as well.

All I need to fix the sound from BLARING DISTORTION to regular volume is to pause the music for a few seconds, then unpause it again.

I'm not quite sure whether it could be a short somewhere in the wiring since I didn't splice into the steering column stalks, and it's happening over bluetooth. I haven't yet tried whether these symptoms happen if I'm listening to the radio or CD (I'll try tomorrow). My soldering skills aren't 100%, but I'll have to check that I properly sealed my splices as well when I get a chance to rip apart my console.

Any thoughts?