It might just be that you were banned because you were doing it exactly once a day.

I use YT's RSS feature to follow channels and playlists I'm interested in and discovered that (somewhat ironically) if I have it query the RSS periodically Google will decide that I am a bot, will return errors for all reads and force me to pass a captcha next time I try to use any Google product (presumably connecting the two activities via ip).

So now my RSS reader does not periodically query YT and instead I manually click the update button when I'm interested...