Hi Rob,
My peppermint shrimp is just over two years old now, in my experience they seem to last about as long as cleaners which is between the 2-3 year span. Just before I moved last month I lost both of my 3 year old cleaner shrimps. That was during a really hot week of weather, my tank did go as high as 82 but I don't think that this was the problem as the tank rose slowly in temp allowing the creatures to acclimitize . Instead I think the salinity increase due to high evaporation was the likely cause, and also the age of the shrimp may have been another factor.
Other sudden swings such as PH and Ca could also cause these sudden deaths.
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