Every few days? Maybe you have a short or they messed up installing it when they did the recall. I think the most current one is green. Is the car cruise control shutting off or the brake light not coming on?
A little bit of free play before the brakes grip is normal, the booster won't cause a brake light switch problem. Maybe somebody's foot or shoe got caught in the wire and damaged it? I can't think of something that would cause repeated failure every few days.
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