Terex TB 60 Boom Lift

I am experiencing drive and control issues. This issues are sporadic. I lose all control functions in the basket other than steer and high idle when attempting to drive. And other times I will have lift functions and yet no dive functions other tan steer and high idle when trying to drive. Though other times you can start it up and have all normal functions. It has me truly stumped and of course it is starting peak season when we need this machine.



Thanks for any advise