hi all i have a 2004 kubota bx2200 with a la211 fel . the problem is it seems that when i first start out the loader will not go up unless i find just the right spot with the joystick (somewhere in the middle of all the way back and neutral position of joystick). then to let the loader down i have to put it into float. i do this several times and then everything starts to work just fine. When this is happening the bucket will curl just fine and the 3-point operates just fine. disconnected the loader and reconnected same result. changed hydraulic oil and filter same thing. Would this be a hydraulic valve issue , or maybe drawing air into the system? Any help would be grately appreciated.