I have never heard of that, What are you coinjecting the Cas9 mRNA with?
You're RNA could be bad but it's more likely there is something in your injection mix that has gone off. which is what the person above is getting at. Also, are you injecting the same amount of Cas9 every time? like do you actually measure the amount coming out? If you're just eye-balling it, it could be that you're injecting way too much without knowing it.
The injection solution consists of Cas9 mRNA, one gRNA, nuclease free water and phenol red dye. The concentrations for working solution haven't changed, and the injection volume is roughly .14nL (usually some deviation from this as the measurement is calculated using a micrometer.)
This is the equivalent to the "is it plugged in" question. But uninjected or control animals survive? Anyone else in the lab seeing the same die off? Maybe its your fish/embryo water?
I would make new mRNA and anneal some new guides (depending on your procedure) and try it again.
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