I would personally stay away from the 50's MIM reissues. I've owned one and the neck was so unstable, plus I could not adjust it due to the truss rod being maxed. I've played other 50's MIM reissues with the same problem. It could have been a coincidence, but I stay away from those basses. I would get the new standard MIM P Bass. They feel really nice.
I have not heard anyone else reporting such issues... if this was really a thing, it would be all over this board. I'd say your personal experience can be chalked up to coincidence, misconception or maladjustment.
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