Philips (DVP5140) DVD Player

I am now on my third DVP5140/37 from WalMart since Oct., 06. Within one month first unit started making strange noises, would show "loading" icon in corner, make some more noises, show "DVD Video" in corner and most of the time stop. Had to keep opening and closing tray and hope it would start playing DVD. Sometimes it would start and then stall and then stop after about 15 seconds. Luckily after two month's of ownership, WalMart took it back and gave me a replacement unit. Have had replacement three months now and it is starting to do the same thing.
03/20/07, received third DVP5140/37 from WalMart. I don't know if Philips had a bad run in production and WalMart was the recipient of all the defective players or what?
They say the "third time is a charm". If not, demanding a refund and moving on.
Have owned a couple lesser known DVD players from "Apex" in the past that performed great for years. Thought I was taking a step up. Fooled me.