Where is the patch hanging up? If you are able to run it down near (a few inches from)the breech & then remove it without trouble the problem might be a "crud ring" forming. If you lose it at any point in the barrel I'd guess either the patch is too loose, or your cleaning jag is undersized.
(I like the "knurled" jag head as opposed to a "ringed" one - they seem to hold on to patches better)