Black screen, frame substitution secursion, error restrieving frame, and no audio bar

  Hi guys, first of all, I am learning English, so bear with my description of these issues that I am encountering with. And PLZ HELP ME OUT.

  So I have been having these issues for so long and I really want to know why would it happen and how to solve it. Sometimes after I inport videos, I would see some part of the video didn't have audio bar that indicates the volume. When I want to review those parts, it will go to two results. First one, the review screen will freeze and sometimes go black, the bottom right starts showing "frame substitution secursion" and "error restrieving frame", but the audio is functioning (I mean I can only hear the audio but no visual images). Second one, I can play and edit the video normally as usual, with audio as well. But it will stop the exportation half way and tell me "frame substitution secursion" and "error restrieving frame" again.

  I hope you guys can understand what I am saying and I have a picture for better understanding. I have tried the "software only" method and it didn't work. I have tried to creat a new project and inport the video but same thing happened again. I have tried a lot and they all didn't work and I want to know why.