Looks like either you've lost gain between the ant terminals and the vid detector*, or your AGC circuit is misadjusted or defective.
*Check signal source, clean tuner, check tuner and IF tubes, wiggle said tubes in case bad socket contacts.
When you develop weak sync in both deflection axes that is a sync separator problem...If the picture has far too little contrast ()along with the synch issue the signal feeding the synch separator (usually picked off just past the video detector) is too weak for the separator to process correctly (even if the separator is functioning correctly which it probably is) due to reasons mentioned in the first sentence.
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