HDV tape won't play back

I recorded 9 tapes with my Canon XH A1 a couple of weeks ago and out of those, two won't play back. I've tried several different decks and cameras. I see the footage is there when i fast forward and rewind, but when I hit play, the screen goes to blue at most points, and at some, it will play and skip. I have tried playing it back in auto and DV just to be sure it's not a format issue. The tapes are Panasonic dv tapes, which I've been using for years. I cleaned the heads before the shoot and before the capturing process. I've never had this happen before. Any ideas?