Is this a root cron or a user cron?

sudo on my machine give me some funky errors and such if I run it when I'm root. Perhaps a su - username instead of the sudo would work?

If it's a user cron, do you have to authenticate your sudo session with a password? If so, the cron-spawned shell is probably sitting there waiting for password input on STDIN. It'll eventually time out, but since the STDIN stream doesn't belong to a TTY that can give you input, it'll sit there.

Hope this helps!