I"ve had this TV/DVD/VCR combo unit for about 6 years. For the the last 3-4 weeks I've getting an error message when inserting a DVD disc in the player "wrong disc type." These are new rental discs of current movies: Netflix, Blockbuster. NOT copies or burned discs. This wasn't happening prior to 3-4 weeks ago. I've run several "cleaner DVD" discs through the player, which work fine, and used canned air to "blast out" possible lint, etc. Is my unit toast now or ?