FWIW, I found that sometimes the Lionel TMCC Direct Lockon would trigger on a perfectly good locomotive. I finally eliminated them from my configuration, and never had another issue. It would only do so on a handful of locomotives, about 90% or more of my stuff had no issue. I could never track down any flaw in the failing locomotives, and the were an assortment. A couple of factory Legacy engines, a couple of factory TMCC engines, and even a couple of ERR Upgrades. Examination of the engines was fruitless, and they never malfunctioned without the TMCC Direct Lockon or on any other layout. I had to conclude that something about the lockon was at fault and moved on.