Gary, the symptoms you mention would indicate a hydraulic pump problem, probably worn out.

The solenoids use pilot pressure to move the valve and for all other functions the FC controller will issue the command via the logic to increase motor rpm as flow is required for the use of all functions...except lowering.

The pump motor stays at idle during lowering so a worn pump will not produce enough flow at the low idle speed to supply the pilot system correctly. Using another function increases the flow and so overcomes the problem, and at higher rpm there is probably sufficient flow to perform all of your operations with no obvious performance decrease.

On these units the pumps were changed from aluminium to cast iron and the duty cycle of the pump raised to increase complete lifetime of the pumps. I would suggest you contact your dealer Berge Manutencion for more information.