Hello Had my blink bonny Scotsman running via the app. After about 4ft of track it stalled then started again. So I cleaned the track and off it went only to stutter again,so I cleaned the next length and tried again. Now it's not responding at all. There's power going to the loco and it's connected by Bluetooth but there's no movement or sound. If I lift the loco off the track it disconnects and reconnects when put back on. Has the decoder failed? Any ideas anyone. Thanks.