Voice Chat not working

Half the time when I connect to the game, despite all troubleshooting I've done to deal with it, I can neither hear the people in the game nor see their video. I've checked my permissions, reloaded the game, cleared my cookies, and done nearly everything suggested on the forum. 

An intermittent issue is an extra-frustrating issue!  Before getting into more esoteric things, would you please carefully work through Steps 1 through 8 of the Roll20 guide to Audio Visual Troubleshooting : Step 1: Make sure you’re using the most recent version of either Chrome or Firefox Please check if these issues persist when using both Chrome and Firefox. Step 2: Give Roll20 permission to use your microphone and camera Step 3: Make sure Video and Voice are turned on inside Roll20 Step 4: Clear your Web Browser’s Cache Step 5: Make sure you have the right ports open Step 6: Check if your camera is working with WebRTC Step 7: Check that your camera is functioning Step 8: Do a bandwidth test If none of the above fixes your issue, please thoroughly work through Step 9 : Step 9: Solving Technical Issues Step 9.2: Ensure that there are no extensions/addons interfering with Roll20 Please disable all add-ons/extensions and anti-virus programs. Step 9.4: Provide a bug report Please ensure that the Console Log is complete.