High speed trim/sterndrive issue with 210 sea ray

by Daniel
(Ringgold GA)

1997 sea ray 210 bow rider. Toward the end of the season last year I started having an issue with the trim/sterndrive partially raising up at high speeds only, and it comes up gradually not all at once. I was able to raise and lower the trim through the button on the throttle handle with no problem. It’s almost like it just needs tightened down somewhere around where it raises up and down so that it stays in place during higher speeds. I don’t know much about boats so it may b something simple. any feedback helps Thanks.