your video heads may need cleaning. see your manual to see if the symptoms match. if so, techs can do it, there are also head-cleaning cassettes but not sure if those are safe. you can also do it yourself but i wouldn't recommend that if you're not skilled at it.
if your heads are dead, uh oh.
my camcorder is showing gray bars when we play it back
and is wavey sometimes have any of you had that happen