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We tackle these sort of problems constantly at work. Rarely are they cabling issues.
Download a copy of pingplotter and set a trace to your router to see if the network drops or perhaps the router is dropping the internet connection.
If the network connection drops to the switch look at your flyleads and sockets. There is also a chance that the network interface in your PC is faulty or that the NIC can't hold a conection at the speed used e.g. gigabit.
In my experience the symptoms you describe are most often caused by IP address conflicts, usually by badly behaved portable devices. Good housekeeping can help, locate the mac address of every device connected to your network (netscan is free and will provide those parameters), including tablets, phones etc and create static assignments in the dhcp table of your router so that every device gets the same and unique Ip address each time it connects. Running switches and your router on a UPS will also help, short power breaks can cause issues.
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