How were your gains set? We have not had an Icon fail on a properly installed and set SAE or SAZ-1000D. If the sub is cutting out, that sounds more like something in terms of the amplifiers current, and if it making some strange noise I wonder about the signal, or if it being over driven, or there is a leak. Nick may say it more smoothly then I can, but the speaker will only do what it is told, so it should only make the noises or sounds it is told to, and will cut out if the signal cuts out. I would check all connections, for power, ground, and RCA, along with settings on both the HU and amplifier. We just got an email from an Xcon customer that said something very similar and he thought it was the sub, when it was the amplifier connections.