I had the same problem, even though I had a static IP address. Turns out another server on my network had been assigned the same (static) IP address. (Duh.) So it does appear that the problem is caused by IP address conflicts, but there may be various possible ways they can happen. If you set yours to static and still have a problem, try shutting down your machine and pinging the address. If you get any replies, start looking for what else could have the same address.
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