I forgot to add in my first reply, that you may be onto something about the ambient temp. After I finished archiving all the VHS I needed to (probably about 7-8 years ago), I boxed it up and it's been sitting in the garage. In So CA it saw anywhere between low 30's some winters to well over 100 in summers. Maybe if it had been kept inside, fewer caps would have gone bad.
But yes, there is probably serious heat generated on the Y/C card, which likely makes the already poor SMD caps degrade quicker, and that's why that PCB is always a candidate for a re-cap.
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