Sounds like a possible engine power issue. Is the check engine light on Second one from the bottom on the right, with exclamation point)? Take note of the engine speed (4th press of the select button, see check codes>>). Is it bogging down? Also check for hydraulic system codes. Press and hold the set switch, then turn key on, when bulb check complete let go of the set switch. Then use the display select button (I think it will be about 7 presses of the select button) to scroll until you see a zero on the left side (for codes). Is there another number to the right of that (could be anything from 0 to 19)? When display reads a 4 (pump 1) or a 5 (pump 2) on the left the numbers to the right will be control pressures. What do they read when a function is stalled?