I purchased an HM6000 and US version transformer recently, and I truly love the app and controller, but my unit keeps shorting out when running two locomotives in a simple double oval layout. The yellow SHORT CIRCUIT screen comes up as everything instantly stops, I press the yellow bar on the app and it runs again for about 45 seconds, and BOOM, off it goes with another short circuit cutout. In utter frustration I've gone back to my old H&M Duette (export 110v version !!) Any advice ??