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This is a small network with Comcast ISP ( Cable ), there are 11 PC connected to network all are wired Ethernet, the same 3 computers will loss there internet connection sometimes, not all at same time. the three can still access shard folders and the server based apps they run. I have replaced the switch( used to add ports for printers) and patch cables and same issue happens. I had a guy tell me it was like the ISP, so i called them and the tech did a diagnostic test, she got back on phone and said there was a downstream issue detected by the software. I am not sure what she is using.. then, the next day, the tech came out the next day and said, there is nothing wrong- the modem has a strong signal. What options are to determine the root cause, what can I consider. Could network cars be issue? I'm lost.

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Network cars? What are those? –  David Schwartz Feb 6 at 21:03
    
If the affected hosts can still communicate on the local network then it's not likely a problem with the local network (switch, cables, network cards, etc) and is likely an issue with the ISP modem/router. –  joeqwerty Feb 7 at 2:28
    
I wanted to inform the site that the root cause of the issue above was IP address conflicts. –  Mike Feb 25 at 21:43
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