Depending on the unit, it may need to be rinsed, or lubricated. See if you can find what type it is, and find the manual….or post photos here and we can help ID it for you.
Many don’t have ball bearings, and just need to be rinsed with fresh water to remove grit and junk. Others have bearings and may need to be lubricated.
also,as mentioned, make sure the top swivel is clean and rotates freely.
Lastly, my furling line was old, stiff and would not wrap into the drum nicely, and the line would stack up and jam in the drum. I replaced the lone this spring, and lubricated my drum bearing a bit, and it is like a new furler.
Good luck,
Greg