Internal optical drive not playing all burned files

[tkmops]

Win 10 64-bit Pioneer BD-RW BDR-212V(2-3 years old)Driver Date 6/21/2006 version 10.0.19041.4355(WinBuild 160101 0800)
My drive burns blank Blu-Ray disks with no issue, but won't play all the files on it.
When I burn 5 one-hour, or 5 half-hour videos onto a blank disc, everything looks like it worked.'OK..burning completed successfully', but when I play the disk, only the first 3 videos play, the last two won't...the red 'loading' light on my drive just blinks, and never loads and plays the last two files.
I've tried playing the burned disk on another PC, and the same thing happens....so, while there's no error msg during the burning process, my burner is not actually working properly?
I'm not sure if it's a hardware issue, or a driver software issue.
Any idea of what's going on...update driver? installing a new drive? other?
Thanks

 

[ColourOz]

Possibly you do not have the correct extensions installed. Try installing Media Player Classic, it's free, and in the settings has all the extensions, click on installing all of them and possibly that will solve your issue.

 

[tkmops]

Weird, it fixed itself---maybe it was the 2 Win10 updates?