Mothership: Had the same problem on my previous gas MH. The brake light switch above the brake pedal was adjusted too close. The brake pedal bounces when you hit a bump and activates the brake light switch and that turns the cruise control off. (Cruise control is supposed to turn off when brakes are applied)
You should be able to adjust the switch so it is not as sensitive but still turns the brake lights on (and cruise off) when you apply the brakes. Hope this helps...
Hooligan, Pensacola, Fl -U.S. Coast Guard Retired
2016 Thor Siesta Sprinter dsl- 2008 Suzuki Toad
Our Pug "Lily" & "George" the Newfoundland