Prodigy Brake Controller Problem

I agree with RCMAN46, but not always. About 7 years ago, when returning from a trip, I was within a 1/2 mile from my storage facility when I noticed when applying the breaks, they would take at first, but then it seemed like they would let go. Happened several more times as I pulled in the storage facility. Took it to my RV service guy a week laterand while driving there, it happend one more time. My older Prodigy was probably 5-6 yrs old at the time. I cannot remember if I got error msg's or not. ANYWAY, he checked out all the wiring, it was fine. He put his controller on and all was good. I replaced with a brand new Prodigy and all was good for several more years before I sold the rig.