My Cruise Control just started acting up, It works at lower speeds usually and the first time you activate it, if you hit the brakes or turn it off, it will not turn back on. Will not turn on over 55 MPH. Any clues? Common?

Any DTC's stored? Just off the top of my head, check the disengage switch at the top of the brake pedal for proper adjustment.

Today, the Cruise control just started working again, no idea why...but I am glad.

If it goes intermittant again, pull up on the brake pedal with your toe to make sure that the brake pedal is seating the cruise interlock switch on the brake pedal that was mentioned. If it starts working when you do this the brake pedal switch needs to be adjusted.