Here's my problem: Once in a while when I shift onto the big chainring the rear derailleur won't shift (i.e., there is no response to me pressing the shift buttons). When this happens I have to shift back to the small ring and then the rear derailleur becomes responsive again. This only happens maybe once every 15 shifts onto the big chainring, otherwise shifting is fine. For what it's worth I tend to use semi-synchro mode and the bike had been sitting in storage for a couple of months while I was in the process of a move. Bar end shifters are SW-R9160 and bullhorn shifters are ST-9071. Any thoughts on a solution are appreciated!
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Borrow an idle fd or rd from your LBS and connect it to your bike. Go thru your shifting and see if the problem still exists with other deraileurs.