Thank your for sharing your insight into this problem and the accompanying tips. I currently run Google Chrome after Internet Explorer deteriorated beyond a useful level. I made a test recording using Microsoft Edge and found no discernible improvement. Likewise increasing the frame rate to the max available, the problem remained constant. Clearing out the Chrome browers cache also had no effect. The only constant in this is that the viewing the clips without recording gets great results. The captured videos breaks up badly.
I recently concluded that the magnitude of the instability and degradation seems to be dependent upon the rate of change of the activity being shown in the clip. Ie, a educational clip containing little movement seems to be a lot less subject to video glitching. A clip of a scene from the performance show like "Burn The Floor" suffers badly. Too me this still points to a memory problem.
Recently I read a post suggesting that a possible cause might be marginal overheating of the CPU. What do you think? For the record I was able to get a reading of the exhaust air to be at 44* centigrade / 111* Fahrenheit. There is clearly an air flow. Like the temperature issue the expected air flow is not documented anywhere that I know of. An aging fan would show a change in power and/or current consumption. I think I can recall a utility that somehow could measure or track these parameter for PC's running XP. Or am I confused. I believe that the normal speed in rpm is documented by the fan makers. I may end up trying to assemble a strobe scope with a light source, optical transistor and a frequency counter. At this point i have no progress to report. Tnx