Here is advice concerning DVD drives that seem to be failing but just need a spindle/hub cleaning:http://club.cdfreaks.com/showthread.php?t=210507
Following these detailed instructions clean the lens, rubber and plastic spindle parts and hub area, and the circular guide in the DVD drive lid.
Panasonic 2006 and newer DVD drives are easy to service. Remove the case top cover to get access to the DVD drive. Remove the four small Phillips screws and lift the DVD drive top lid. When viewing the DVD drive from the front (where the tray rolls out) notice the roller assembly at the rear of the DVD tray. This mechanism must be positioned to the left corner before reassembly so these parts will be correctly aligned to the guide rail on the underside of the drive lid. With the 2006 and newer models opening of the Panasonic case, removing the DVD drive lid, cleaning the drive, closing the drive lid, and closing the case takes around fifteen minutes.
With 2005 or older models the case cover and the front panel assembly may need to be removed in order to give clearance for the DVD drive lid to be lifted somewhat at the front, slid forward, allowing the rear to disengage, following which the lid may be lifted off. The opaque plastic part at the left rear seems to be a retainer/guide. Allow around 35 minutes for opening the case, removal of the front panel after loosening the snap clips at the top, sides and bottom; removing the DVD drive lid; cleaning and reassembly.
On a combo recorder be sure to hold the VHS door open as the front panel is fitted back into place. This will correctly align the VHS door opening mechanism.
I have an older (2003) Panasonic DVD-S35 player where the DVD drive itself is of a more "open" design, but cleaning access to the rubber spindle is more difficult. Use a long-stemmed cotton swab.