Thanks for the reply Mike,
I didn't try to AUX1 + 0 when the issue occurs. I'll give that a shot tonight. The sound cuts out right after a left curve when the engine has just left the curve. It cuts out for only a second or two and then continues on as normal until the next left curve. I was able to stop the engine in this position and the whistle and bell didn't work. I'll try and take a video of the issue and post it.