Sounds like it might be a software problem (could also be virus, spyware/adware, any number of things), open Task Manager before hand and see what's running when you do the video and see if any 1 program spikes on either mem or cpu usage (other than MPC or VLC [which I assume you're using cause you said you've been doing repairs/working with machines for a while] such as explorer) and if it's a non-critical process either end it or look it up for an explanation of what it is.
P.s. What OS are you running.
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