Horns Cutting Off

I've heard so many complaints about the horn_end file not working in numerous locomotives. The main 2 are the GN F& and the MP ES44. What could possible be causing things like this to happen?
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https://www.railworksamerica.com/forum/viewtopic.php?f=29&t=9233
1225fan5358 wrote:I've heard so many complaints about the horn_end file not working in numerous locomotives. The main 2 are the GN F& and the MP ES44. What could possible be causing things like this to happen?