A few years ago mine was cutting out whenever I turned the blinkers on, so if I was going along a two lane highway and I wanted to change lanes to go by another car, the cruise control would turn off. Turned out to be an intermittently broken wire in the blinker stalk, nothing that a new $500 blinker stalk couldn't fix.
Yours will be probably be something different, possibly an intermittent brake light switch or some other trivial thing.
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