Panasonic DMR ES45V trouble playing DVDR

[qanda]This thread is about the Panasonic DMR-ES35V - DVD recorder / VCR combo. Click here to see full specs[/qanda]My Panasonic DMR-ES45V has trouble playing DVDR recorded DVDs erratically. It will play for 20 or 30 or 40 minutes then freeze. I tried opening and shutting the tray, cleaning tray, restarting etc. Sometimes on a disc it will play some episodes, but not others. Please help, thank you.

Clean the disc, clean the lens and the spindle.

The lens/hub/spindle cleaning procedure is found here:

Before reinstalling the DVD drive lid be sure that the roller/slider mechanism at the rear of the disc tray is positioned to the far left (as viewed from the front of the machine). This will correctly align the roller/slider with the guide rail on the underside of the drive lid.

This post has a photo showing the hub/spindle/lens and the correct positioning of the roller/slider: