so ive had my new bike for about a month now and for some random reason. the chain just snapped. ive been having problems with my bikes for a while. my previous bike had the derailleur hangar shear off 3 times within 2 months of getting my new bike. i just got a Giant Trance X4 and now the chain has broken off. is it just bad luck or am i doing something wrong? and i have not had any major crashes on the new bike either.