MKV/AC3 Audio Issues Recently



Hello - So recently several videos in my library are not playing audio at all, the only fix I have been able to find is reducing the quality setting while streaming the video (If I lower it by one or two setting the audio returns).
While streaming and using the info button I can see that it is 2 channel AC3. Not really sure where to start I went through the server setting but not much about audio there. (Server is on Win 10)
Any ideas on where to look?