Purchased DVD new from Amazon.com on September 03, 2018.
Received DVD on September 07, 2018.
Have viewed feature three times.
Started viewing again today, December 07, 2018, and playback started stuttering halfway through feature.
Ejected disc from player and examined only to discover visible coffee color of 'disc rot' - see image.
Seems that more and more standard DVDs are succumbing to this manufacturing failure.
Convenient that the issue only developed after the Amazon return window had elapsed.
I wonder how long the new blu-ray DVDs will last once they are superseded by the next medium.