I had the same issue. When the dialogue would stop playing (happened A LOT), we had to rewind and replay to hear what they said. There was also a very loud screech audio spike sound every 5-10 minutes that hurt our ears.
Also, a night when my friends were over, when I originally rented, we tried everything to get the video to play. It stated that there was a problem in our area. An hour later, we gave up. Row8 would not refund my money the next day even though my friends were gone and the movie was no longer needed. Ended up watching weeks later with my daughter just to not feel so ripped off. Missing tons of the dialogue, stopping & rewinding, turning the volume up and down: I still feel ripped off. Wish Roku had a way for people to let others know to not throw their money & entertainment time away! Row8 is just wrong!