Cheryl, are the stripes across the roll, or along the long direction? Since this is 2 1/4 square, it is hard to know. If it is across the roll,about the only possibility would be the film end touching the emulsion, and moving during the processing. If it was a filling problem, the stripes would be running
the same direction, and be on the bottom of all the frames. I would think that if the stripes run the short direction, I would look for a problem outside the tank. A light leak could run that direction, and cause the random stripes. Put the film back on the reel and see if the stripes are in the same location.If your camera has a focal plane shutter: it could be sticky??? or just a plain old light leak it the darkroom.