I have solved have problem just now. I found out that is because I update my Premiere Pro to the latest version, then it maybe have some bug? so it turn out to this problemNow I install an older version of PR, then the problem is solve
I also think it's a PPro problem and not hardware or clip format related. I only started having this problem recently (a few months) and I didn't change anything in my setup. The computer hardware is the same, the cameras I use and video formats are the same. The only thing that changed is PPro and driver updates. So maybe graphic card drivers could be the problem too. I have an Nvidia GTX 1070, and 32 Gig RAM.