I have a 2011 Puma FTD with a Mercury Pro 250xs and when I was out today, when in gear and idling thru the 6 mph zone. When I trim all the way down I get one beep and the “WF” flashing a couple of times. Also when in gear when I would trim about 1/2 way up the same thing would happen. It would only do it in the same 2 exact spots and go away immediately . When I scrolled through to “faults” & “warnings” it would say no fault and no warning. The boat ran great, got up on plane normally, plenty of water pressure and everything else functioned properly. No faults or warnings when running at faster speeds.Any ideas?