A similar thing happened some months ago when, for no obvious reason, all the right engine sounds for acceleration and deceleration were being produced but the unit just sat still. After a long search on the web I found a fix that required re-setting a CV or two but I didn't keep (or have lost) the website address and can't find that source again.
The Budd hasn't been used for a few weeks and today, again for no obvious reason, it won't respond to the controller and even the engine sounds aren't responding - the unit just continues to idle.
Any suggestions on a fix would be welcome, also any suggestions as to why the unit slips into this unresponsive mode and what can be done to stop that happening.
Thanks.