In my experience, it sounds like you have tripped the run timer after a re-level instruction. Then it sounds like you're by passing in the block. Cold oil is harder to push thru the block as it is thicker. I would also make sure your re level limit or magnet isn't real close to true floor level as it then cant have a good action the come back to floor level. You cant test this by opening the manual lowering valves. I would check the block as JKH said to make sure you haven't got a bad o ring or gauze.