I have 6 month old Toto Drake toilet. I installed, and after a flush, the tank refils, as required, and then when it fills it to the top, there is a loud squeek as it shuts off the water coming into the tank(the float / cut off valve). This has become a bit annoying and like I said, really loud. Any suggestions on ridding this noise. Toilet works great and I've been tempted to just ignore (ain't broke.. don't fix it). But I think I'm ready to trouble shoot this if I can.