I've had my Silent Loop since October and it's been absolutely silent until recently where I've noticed a very quiet rattling coming from my case. I've investigated by eliminating all other sources of noise and the rattling stops when I unplug the pump. My machine is pretty quiet and while the rattle is only slight, it's audible over the rest of my system. I've given the pump a twist and shake to eliminate any trapped air but the noise is still there. It seems to start as the system warms up. My temps are still good so I know the pump is working but the noise is annoying. Google doesn't bring up any results for similar issues (which I guess is a good thing) but I'm wondering if anyone on here has had any pump noise. There definitely wasn't any until recently. I've tried recording the sound but my phone doesn't really pick it up over ambient noise. Is a bit of pump noise normal (bearing in mind this is a rattle rather than a hum) or is there more to it? I'm currently sat about 7ft from the machine at the moment and the noise is distracting over the TV on low volume.