I’m not sure surging is the right word. Anyway, today I was was doing some rotary cutting and after 45 minutes or so the 3 point arms started lifting and dropping and inch or two with no input to the control. I shut down and checked all the houses for leaks and for broken or damaged linkage. I also checked the rear remote controls since I had had a previous issue with the hitch not lifting and it turned out that I had bumped the control with the detent into the detent position. The fluid level was fine. When I started the tractor back up, the issue had stopped and it was working fine. Has anyone had this issue or know what may have caused it?