glitches in APP project appear after no changes to project or source video

[Vchat20]

Pretty much what the title states. A premiere project I have been working on for the past couple weeks has gone untouched for a week or so. I just pulled it up and one section of the video has a few glitches in it where the video is blank in the preview window and the exported video doesnt show the blank video but rather it seems to "pause" on the previously shown frame.

Ironically enough the 2 parts of the video entail one source video file which I just pulled small clips from and placed in the timeline. This file is your standard dv format. DV codec, 720x480, no audio.

Again, neither the project file or the source video file have been touched. I have even double checked the source file in question and it plays just fine through all the questionable sections.

Any ideas on whats going on? thx

[Vchat20]

Also, I have went back and checked old "auto-save" files and they show the same thing.

[Vchat20]

hmm. thats odd. seems to be back to normal now. Basically when I had checked it before and noticed these glitches it was probably after a number of resource intensive/directx based applications have been running as well as numerous cases of the graphics card going into a sort of "standby" mode (this is on my laptop and when the lid closes, the screen AND graphics card shut off.). I just restarted it not more than an hour ago and its only been running firefox so far and hasnt been closed and the project seems to be back to normal.

But im still confused as to what would cause this because it was not only affecting the project inside premiere but even the exported video.