It sounds like you need a OBDII test. try autozone. it is possible that the brake switch is faulty that would cause the cruise control to turn off, if it is getting a signal that the brake is being depressed.
You may even have multiple sensors failing right now. Start with the OBDII test and that will tell if there is faulty sensors or switches.
Then if you want, post more info on fixya again, (fault codes and such) and we can help you further.
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