Hey all, a few days ago my rMBP's trackpad started making crunchy noise whenever i press it while using it on my lap or on chest when i am lying downn, it goes away for a while when i blow on the edge of trackpad so there could be something under it but it works perfectly when i use it on a table. Basically when i press it, it gets slightly stuck halfway through and thus makes that clicking/crunchy noise. Any idea why this is happening and is it something that is covered under apple warranty? Hoping for any reply. Thanks.