Tonight my EZ locked out with "control fault" and then went to "No terrain Adjustment." message and will not engage. 

Powercycle it and after it acquires position it will work again....first couple times it only worked briefly then it worked for 30 minutes or so before giving the message again.  At that point I finished my end rows by hand and parked.  

Anybody know what the deal is with this?  Unit has 30 hours on it, been in the tractor about a month.