I agree that this camera, like all purely mechanical cameras needs regular exercise and agree it's 'hanging up'
I had this issue on a couple of frames on a roll I shot in the winter after having not used it for some time.
In fact I really had not used it much at all since buying it from someone that hadn't used it in a couple of years.
After using it a bit more regularly, I found that this problem went away.
I have a bunch of images I shot in fairly cold damp conditions in my gallery. No problems on the 12 or so rolls I shot at that time or since.
Have fun-as many have remarked, it really is a blast.