the wiring loom was so jacked on my KI monitor that I just did away with it entirely. you can plug the remote board directly into the chassis. makes it more difficult to adjust (I really need a good sized mirror!) but it eliminated the V-pos/V-size gremlins at least. (chassis actually needs to be recapped... but it works for now)
your problem sounds much like something to do with your sync. I guess it's hard to tell though if you have a picture only sometimes though.
surprised no one else has chimed in yet... guess it was x-mas after all. hope you had a good holiday.