If you have fallen behind a little bit in studying, would you take the opportunity during winter break to catch up on studying or let your brain chill out for a few weeks and restart?
I would take some of the non-major classes during the break so you can catch up. Try to avoid taking something that's really intense because with the condensed schedule, it will be hard for you to learn a lot in a short amount of time.
I can imagine if you are heading to community college to get some miscellaneous classes or electives out of the way, like art history, then you can probably do it over the summer or winter break.