I often have trouble developing 2 rolls of 35mm film in my Paterson System 4 tank. Even after buying new reels the results are still problematic. One roll turns out fine, the other seems to always have issues. All the frames look good to about 10 on the problem roll, which is roughly where I rewound the film and transferred it to another camera, then they get weird for about 6 frames, then go back to being fine. Yes, I thought about the problem being the fact that I switched the film into another camera mid roll, but I don't understand why the problem would have been isolated to about 6 frames. The negs have problems all the way out to the perforated edges, which is why I suspected development. Any ideas? I may have to repeat this w/o switching film mid roll.