My Akai AD151X dvd player will not longer play any of my dvd's from the lost tv series, all copies are legal, all disc's have played in the past, none are damaged and all play normally on my computers dvd drive. Have no issues with any other dvd movie or tv series, why would a dvd player suddenly stop recognising a set of dvd disks one week after playing them?

When a DVD disc is created, it is encoded with a "Region number." The disc will only play on DVD players with the same Region number - for instance, a Region 3 disc won't play on a Region 1 player.
Region 1: U.S. and U.S. Territories, Canada
Region 2: Japan, Western Europe, Middle East, South Africa
Region 3: South Korea, Hong Kong, Taiwan, Southeast and East Asia Region 4: New Zealand, Australia, Pacific Islands, Mexico, Central/
South America
Region 5: Russia and the former Soviet Union, Africa, Indian
subcontinent, North Korea Region 6: China
The only way to get around the region codes, is to rip a DVD to your computer and remove the region code. Then burn the DVD to a DVD R. There are programs around on the net, but I'm not sure it is legal in all countries.
Google for the programs.
A DVD player sometimes allows you to change the region code once. But it not even would allow you to switch back after you changed it once.

You cannot use a DVD-RW disc on a Durabrand DVD player. It is not a compatible disc format. DVD-R discs that have been finalised (as well as shop-bought legal copies) are recommended for this player. As for video and audio bitrates, check out other forums on video to DVD converting and creation for more information. It is down to trial and error.

Providing that you have a legal DVD player that is meant to play discs in this country and that you have bought a legal disc (not an illegal bootleg copy) you might need to do a firmware update on player.

If player has internet connectivity you can do it directly on player - it should be a menu prompt to update firmware

if no internet connection is available on player you will need to contact Samsung and have them send firmware update to you on a disc and load it that way

If either disc or player is a bootleg or grey/black market purchase than that is the issue

Players will only play discs from the region they were made to work in

USA is region 1

good luck

press and hold stop button on ur dvd player

HandBrake

It sounds like the recorder will only record the dvd+ format, which does NOT need finalizing to play in other machines. ( you can record a dvd- , play it back on the machine you recorded it on, but need to finalize it to play on other machines)
The other units may only accept dvd-.(dvd- being the same format as you would buy or rent a film on)
One option, record the dvd on a dvd+rw (if possible) then copy to a dvd-r using your computer. The average use of a dvd+ is 1000 recordings.
There are many free disc burning suites available to download. Just google "free disc burning software" and take your pick.
I use 1 called "magix goya base" for copying disc to disc and "NTI" for burning to HDD and then to disc, if you only have use of 1 drive.

You'll have to take the set into a Service Center for that to be repaired.

BD-P1000 Update Solution
The solution that worked for me: I went to www.samsung.com/ca and downloaded the Samsung BD-P1000 player's firmware update to my desktop. When opened, I was directed to"burn" a DVD on my computer. I then inserted the new DVD in my Blu-Ray player. The player automatically checked and confirmed player model number and registration and uploaded information from the DVD and the update was complete. The BD-P1000 then flawlessly played the rented Blu-Ray disc of "The Scorpion King".
Thank You Samsung!

Try and get a Lens Cleaning disc and put it into the DVD Player side and wait until it's done.