The other day while working on my wood splitter I had it elevated with the FEL. About every five minutes I had to start the tractor and raise the FEL up again. Well that got annoying so I left the tractor running and the FEL continued drifting down at about the same rate. There are no obvious leaks. Is this a concern or normal. Probably the first time I have left anything of significant weight elevated. Tractor is 15months old 120hrs. 50hr service completed about this time last year with new fluids and filters. Thank you