I need some assistance with my YANMAR Diesel Dixie Chopper. It’s a XWD3500 with a 60” deck. It’s approximately 13 years old with 661 hours on the original engine. I’m the original owner. Problem - It cranks and starts up immediately (no issue), but after 30-45 minutes of being on with blades engaged it just shuts down - just like turning off the ignition//no smoke. It will start up again, but after 2-3 minutes shuts down again. I let it set for 30-45 minutes then cranks up again and won’t shut down again for another 30-45 minutes then shuts down again. I’ve replaced the fuel pump, fuel filter, drained water separator, drained both fuel tanks to no avail. Guidance is much appreciated.