Originally Posted by
fotooutdoors
I've had it happen with a Shimano freehub. I didn't totally disassemble the freehub; I just removed it, and pulled the back gasket. Then I used tons of WD-40 on it to displace the water. I blew it out with an air compressor, then let it dry. The next morning I squirted oil in, and replaced. That was 1 1/2 winters ago (the first winter on the hub), and I haven't had any problems since.
My solution as well. I don't know if it is old grease getting stiff or moisture, but the WD-40 flush worked for me on 'old' freehubs. The fact it didn't reoccur makes me believe it was old grease.