Welcome to the forum
You problem might be down to the quality of some of your media.
Ritek has caused playback problems for may people in the past.
Generally the best media out there is TY & Verbatim.
You might also want to try slowing down your burn speed to half the media's rated burn speed --- you seem to be using all 16x so slow the burn down to 8x and see if this improves things for you.