I installed the N18TXS Decoder and speaker in my Flying Scotsman engine last night and it ran perfectly for 20 minutes until I had to clear the table for tea. After I had set it back up, I had an error flagging in the app saying "Sound data missing" I tried browsing profiles and reinstalling the same profile, SD036 and also SD037 for A1/A3 a few times but after running through for 15 minutes and updating and then removing and re-adding the loco to the track I was still getting the same error with no sound and no control of the engine at all via the app. I even reset the Decoder and removed and re-added to the app but nothing at all. After a couple of hours of fiddling I packed it away and came back to it again this morning. I tried profiles SD036 and SD037 again with no luck and after looking through the profiles I found another TT Flying Scotsman SD040, I ran through the installation of this and shazam! It works perfectly again. It is strange why this happened and I thought the decoder had got corrupted, teething problems I presume?