Originally Posted by
spelger
regarding the freezing switch...were any active parts replaced or just passive switches? a power cycle implies some active parts but i would expect an electro-mechanical part replacement only. a few times i've had remote controls that had buttons that failed after time. dust or other dirt gets in between the conductive parts preventing switch closure. disassembly and cleaning with rubbing alcohol has fixed that every time for me.
Last time this fault happened I changed the entire bar/brifter/wiring assembly and then it worked flawlessly for 2 years without missing a single shift. The control unit on the bike where the brifter wires are plugged into was not replaced. I expect whatever caused the problem 2 years ago within the bar/brifter/wiring assembly has now happened to the replacement set.