Sometimes when I develope my film there is absolutely nothing on it. Ive had my camer for quite a while and never had this problem with store developed film, so I dont think its the camera. Also I can hear the film advancing and it rewinding so I know its taking the pictures. Ive had this happen to me three times so far and its really getting annoying so Im asking for your advice. Do you think its possible I am letting it develope too long or maybe not getting the stop bath or fixer right? any info is appreciated!!