Engine issue

[GWay83]

S/N 2B785175
2020 250 Pro XS
2010 Ranger Z520

So, I had an issue today on the water. While running engine sounded normal and performance was good. When I let off the throttle (hotfoot) to come off pad, the motor did not slow down, began to surge somewhat and then got a constant beep. With boat not coming off pad I reached for the throttle thinking maybe it got stuck. Throttle was not struck so I grabbed the control and put it into neutral but it did nothing.... I had to turn motor off with key and finally it shut down. The incident happened after running over 5000 RPMs for about 5 min on the way to the ramp this afternoon. I didn't have a problem while running spot to spot all day but I was just cruising at around 4500 until on the way back.

My question is, do I need new cables or is do I need to have the throttle looked at with a computer on the motor?

The hotfoot is brand new last year as well as the cables.

Thanks for the help

[EuropeanAM]

Need to have someone KNOWLEDGEABLE check this, strongly recommend it be an authorized dealer. Check for damaged cable, control, demand sensor or even ETC.