Been running Force shifters this year (and love them) but this week the rear shifter has started to stick a bit. The lever action after a shift is slow to click back to be ready for another shift. The rear der. completes the shift and in watching it, it seems the rear der. moves over okay but the lever hesitates getting back to 'neutral'.

Any suggestions? Others that have had this happen?
Lube? New housing/cable?

check your cables, sounds like contamination to me...

With DA that is a symptom of the cable fraying at the shifter end. I'd at least replace the cables. You should replace them yearly anyway IMHO.