i have 8 older tapes 3-8 yrs old.they played back fine a year ago & now they are distorted on the right side. I ran a cleaner through my sony 350 camcorder & it still does it. I took one of the tapes & recorded footage on it at the end to see if it still did it. my playback is fine now but not on any of my other tapes. are my tapes dirty or what?any help would be appreciated.