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If another computer exhibits the same problem, then the PC is not the problem. I assume you've already replaced network cables... thus the next steps...
If the problem occurs at the same time of day roughly each day, something is causing it... you need to look for a system or device that is on only during that time (air handler, light fixture, network printer, etc...) something is interfering.
If the problem occurs randomly, try a different switch port on the network switch, or better yet, a different network switch... something may be overheating or failing.
Lastly, get better tech guys.
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