This problem has been happening for months. I'm not sure how it started but the video can play for about 10-15 seconds before it just stops completely but the audio continues to play. I can upload any settings I just don't know what specifically would help. I cleared out my laptop a while ago and I have a lot of storage free. After Effects was working perfectly fine for about 6 months before the problem started.
CPU: Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz 2.81 GHz
GPU: Intel(R) HD Graphics 630 1.5/7.9 GB
RAM: 16 GB
OS: 64-bit operating system, x64-based processor, Windows 10
Verson 16.1.0 (Build 204)
Frame rate: 29.97 fps
Frame size: 1920x1080
It happens with all projects I have, including old ones before the problem and new ones started after the problem. I've cleared the media cache multiple times, although I have tried resetting my preferences. Hope this information is sufficient, I am happy to send anything else you would need.