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4200 Hydraulics problem

Mitch 1999 4200 with 420 loader and Hydrostatic. While pushing snow this winter lost lift power to the loader. Hyd fluid level was fine. Changed the fluid and filters, there was very little debris in the suction screen. Now the loader and 3pt work normally until the tractor has been operating for about an hour and is hot. Then it loses power to the loader and 3pt and will either barely raise them or won't lift at all. It's not leaking any oil from any lines or couplings and seems to have plenty of lift power for the first 30 mins or so of operation. Oil level is correct. I've always used dealer supplied JD oil and filters with changes per the service schedule. Any ideas for troubleshooting and repair are greatly appreciated.

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