Welcome to the MyCE community :flower:
I'm not sure what is causing your task 2 failure because error code 116 means-> HWS_WRITINGFAILED 16 // Writing failed (write error or process aborted) which is not much help, however there are several factors that can cause this isse which are
- Firmware of the drive/burner is out of date
- Low to poor quality media used
- Burning to fast
Please check the firmware of your drive/burner to make sure it is up-to-date
On the media I only recommend either Taiyo Yuden and/or Verbatim brand (especially on video backups)
As for the burn/write speed if you use the recommended media I gave above you can go with the rated speed of those media brands otherwise never burn faster then 8x
I will assume you are using the VSO burn engine which is the default of DVDFab, the VSO software has issues with some drives/burners and also has trouble with the write strategies found on low quality media.
Even though your using the same brand of media you have always used the write strategies can change from spindle to spindle do to the fact that the so called manufacturer i.e Memorex (in your case) is not the actual manufacturer but rather had them made by another and depending on who gives them a better price on producing the disc's the write strategies can change.
If you are going to use the lower quality media I recommend you set DVDFab to use ImgBurn as the burn engine which is the highly recommendation of the MyCE community, if you don't have ImgBurn installed you can find it at imgburn.com and there is a guide below in my signature on setting them both up