Cruise Control

First thing that comes to mind is you could have a faulty control switch or faulty switch circuit due to wiring damage. You didn't say, but I assume that the system works normally except for this. If so, I'd suspect the switch or circuit. If not, the problem could be deeper. I recommend finding a Mazda specialist for help on this, cruise systems are more electronic that in the past and not as easy to diagnose. An auto electric shop would be good for this problem too. If you want to find a Mazda specialist, here's a directory link for you: https://repairpal.com/mazda-repair-in-midlothian-texas