Trouble Loading Discs?

I have a Pioneer DV-C603 5 disc DVD player. I'm having trouble loading discs. When I press the open tray button, the tray will open and then close before I can load the disc. Occasioally it will stay open so that i can load the disc after several attempts. Then when i press close, it will attempt to load the disc for play and then the tray will open automatically. After several attempts pressing the open, close button I can get the disc to load and play. Once it is fully loaded and playing it seems to work fine. Is this issue worth repairing? Is it something I can repair myself with the right parts? If so, how wuld I do it?