the cause of the green glitches may not be the camera original recording but the software you are relying on to play back the clips on your computer. Frequently a out of date or wrong plug in can cause the green glitches, I’ve seen this happen with P2 files in the past .
I’ve had my C300 for more than 2 years and have not had any green glitch problems in that time and have shot thousands of hours of material. try playing back your original cards in the camera if you have them, chances are they play normally, which would likely point to something downstream of the camera, which is to say your computer and the software it is using to play back/transcode clips.