I have this weird problem, whenever i tight my chain, and then pedal my bike at one point it makes a weird noise and goes stiff, so i normally ride with a loose chain, but yesterday i got pissed off with my chain banging on my frame and I tightened my chain and rode my bike with the weird sounds and stiffness,after a while my chain has become loose by itself again even tho the bolts were tight, now even when mu chain is loose my cranks are very squeaky, they never used to be. Any ideas whats going on?