Your GH seems abit low... most likely the shrimps are short of essential minerals to molt properly and build new shells (could be one of the reasons why they quickly eat the shells of fellow dead shrimps).
It's not just temperature, if the overall conditions in the tank are not favorable to the shrimps, they have to direct resources to surviving rather than breeding. Shortage of nutrients makes them weaker so they become more susceptible to even small changes in water conditions.
Maybe you can try adding some shrimp mineral/vitamin supplements or perhaps a mineral rock into the tank, see if it helps.









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