Recently purchased Champion 27 ton log splitter from home depot. It was working great for the first 5 hours or so. In the middle of my splitting session today the splitting force got extremely weak all of a sudden. I checked the hydraulic fluid level and it seems to be right where it should be. I split on a sloped driveway and was wondering if that could affect splitting force by altering the flow of hydraulic fluid. But am not sure why this would affect it now and not earlier. Thoughts?