530 lift stops working after an hour or two

[FWS]

Hello my 530 works great for an hour or two then the lift starts slowing down and within a few minutes does not lift at all. Tilt is still working great and drives normally. The arms will stay put if I turn it off with the bucket raised so it shouldn’t be the pistons. This happens every time I use it. I get an hour or two out of it then have to let it sit until the next day. A 24 hour break seems to cure the problem but it happens every time. I use it once or twice a week on small projects. Any suggestions would be most appreciated.