Western Star 5700 xe RPM spikes

I drive a 2016 western Star 5700xe with Detroit engine, and 18 speed manual transmission.
When driving on the highway and changing gears at times the RPM suddenly spikes up to 2500 between gears.
My company has accused me of abusive driving habits, but I have been driving for 30 years and have never abused a vehicle.
I think the computer is wonky and when I change gears: clutch in, accelerator off, shifter pushed/pulled out of gear, clutch out, clutch in (RPM's spike) I freeze and then tap the accelerator RPM's drop and I then put it into another gear.
The accelerator is not sticking because when you take your foot off it - RPM's drop normally.
Has anyone else had this problem?
Does anyone know how to fix the problem?
Thanks Kevin

 

Here is what I have found out since my last post, the cruise control is not shutting off when you push the clutch pedal in to drop a gear - the ECM is making the engine run up to 2500 RPM's when the transmission is in neutral (between gears) and the clutch pedal is in.
I have asked them to fix the problem, but they have ignored my requests.
I now have to manually turn off the cruise control before changing gears - i.e. when dropping a gear or two to climb a hill.
Please be advised that the dealer is trying to void the engine warranty based on over revving - but it is the ECM that is doing the over revving.
I hope this helps anyone else with the same problem.

 

Thanks for info lets keep the info flowing to protect our jobs.