No, never contacted OPPO. I will try clearing internal storage, if I can find the option, and see if this fixes anything, though. The lockup only happens about once a month or so. It's the video movement quality that has me worried at the moment. I'm thinking about buying a cheaper, but good quality, BD player just to see if that fixes any problems.
When I originally bought my OPPO 93, I had also just bought a new Panasonic model. From A/B comprison, I couldn't detect any difference using the Samsung 32 inch LCD model I had at the time. Now I have a Panasonic 65VT50 and it might be a different story.