Need help.. cruse control/ high idle

I have a 07 T800 that I run a rolloff trailer with. I use the high idle constantly to speed up the hydro pump. Lately the high idle turns off on its own for no reason. Sometimes the high idle cuts out many times while I’m running the hydros. Can’t figure it out. The cruse control has never acted up while driving down the road. Just the high idle. I’m lost and looking for suggestions. Thanks in advance!!

 

Wouldn’t all those things also affect cruse control. Using cruse control hasn’t been an issue. Just high idle.

 

Would all those things also affect the cruse control?? The cruse control works with no issues. Just high idle.

 

It’s going in for overhead work, I’ll have them check it out.