Eisbaer LT noises

[FLosse]

Hello,
today my Eisbaer LT started to make weird noises. First of all I thought it would just be the water starting to flow, but even after hours the noise was still there. I started shaking the case a bit, turning my pc off and on again in the hope that the air, that is probably in the loop, would go away but the noise was still there.

Now I laid down my PC on the side and it started to get really weird.

I immediately turned my PC off and I messaged the Alphacool support (waiting for their answer).
Maybe someone who had similar issues with a water cooler could tell me what it might be and what I can do to fix the issue?

 

I attached a video where you can hear both noises. First more like a "rattle" noise and laid down it sounds like the thing is wrecked.

 

Sorry for the english and thank you for the help in advance ^^

 

[FLosse]

UPDATE
I just tried some techniques to get air out of the loop. Now it is silent again, but only if I dont move my case again. Everytime I tilt or just move my case the noises come again and only diaspear after "air out of the loop techniques" (dismantle the CPU block, turn the power on / off and install it new). I checked the fittings and the loop. Everything is dry, so i cannot detect a leak.

Any ideas why and how this happens?