Sound stop working,
should I try something before I send it in for service

I purchased this engine and I am using the MRC Prodigy express controller. I am trying to change the address on the main and it won't let me. I am able to change the address on every other engine I have except this one. I think it is an engine issue because the control doesn't blink the send message to me once I change it.  I am able to control the engine with the default address it came with I just can't change it. Is anyone out there using the same controller? Has anyone had problems with these engines? If anyone has any ideas let me know. Any help is appreciated.