Bread-Bakers v098.n023.15

Anyone have a suggestion for this problem -

My West Bend breadmaker, only a few months old,
hasn't been mixing properly.  I've measured ingredients
very carefully, am using the same recipe that worked
great before.  But when it gets to the knead cycle,
the dough is still kind of grainy and in little bits,
not mixed yet.  The paddles fit fine and are turning
fine.  I can't figure it!

TIA for any help -

Heidi Nick