Likewise what Caitlin said, the most confusing part about this post is how you're uncertain that the feeder was thoroughly thawed and you've had him for over a year? After that amount of time your thawing process should be pretty solid. So along with reviewing your process for thawing feeders as others have mentioned, I wouldn't become complacent in your methods no matter how long you've had your animal and be as thorough as possible.
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