Hello! So a month ago, I got a Bronica ETRS and loaded some film into it. When shooting with it, everything seems to be working fine except when its nearing the 10th to 13th frame. When I crank it to the next frame, sometimes, it doesn't cock and I rotate it twice or even three times before the shutter is cocked. Sometimes, the crank only does half of a usual turn or even a quarter before cocking the shutter. Looking at my developed film, it confirmed that it did skip a few frames or shot over a few frames and costed me about 1/4 of the usable frames. The multiple exposure mode isn't activated as well. Is there any way to fix this...? Or is it how I load my film as this is my first medium format camera? I shot multiple rolls with it and It happened to 2 out of the 4 I shot and I swear I loaded them correctly. Any help?