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It happens when I play games mostly. My desktop pc loses its internet connection (connected via ethernet) for a small amount of time (1-2 sec), dropping from games and raidcall and every other programm that uses internet.My laptop in the same time keeps having internet connection via wireless(always leave a stream on from twitch.tv to check). I've changed all cables but nothing happened.I have re-installed my network driver (have Asrock H77M for mobo) , switched to Linksys WAG200G from Thomson 585 v8 , still not fixed , disabled windows defender still not fixed, checked with MBAM for malware , still not fixed and disabled IPv6 cause I've read sometimes it bugs with IPv4, still not fixed and I disabled some other programms that used internet connection but still nothing happened.I have disabled windows updates (have win7 64bit on a new pc), and I use eset smart security 5 as an antivirus.My ISP says it's not my internet dropping and I can see it on my router - all LEDs working properly but I lose connection on my desktop.Also I've unchecked the energy option at the device management -> network adapter. EDIT : I've read somewhere about NVIDIA and ASUS having something to do with that problem but they didn't elaborate much.I am using NVIDIA and ASROCK(which was ASUS ago iirc) just in case this helps.

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Have you verified this problem isn't just simply your ISP? You should enable Windows defender that wouldn't cause you to lose your internet connection. Your ISP has every reason to claim its not them, have them come out, verify ALL their equipment. I had a problem like this and it ended up being my ISP. –  Ramhound Apr 15 '13 at 11:16
    
Yes I've contacted my ISP many times and it's not on their side.I'm telling you that one of my computers only lose connection and not the other. –  user2192519 Apr 15 '13 at 11:54

2 Answers 2

You've mentioned that it happens when you play games mostly. It sounds like your computer is overheating.

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Can't be.It's brand new and temps are around 30-40 celsius. –  user2192519 Apr 14 '13 at 22:01
    
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. –  Carl B Apr 14 '13 at 22:29
    
@user2192519 - Just because your comptuer is new doesn't mean it can't overheat. –  Ramhound Apr 15 '13 at 11:17
    
True but I told you it is around 40 degrees and isn't overheating. plus I can't understand how overheating would make it lose internet connection instead of turning off or something else. –  user2192519 Apr 15 '13 at 11:53
    
What is around 40 degrees? Your CPU? How about the GPU? If your wifi adapter located closely to the GPU it may be overheating. Try to use the ethernet cable instead –  Vlad Spreys Apr 16 '13 at 20:28
up vote 0 down vote accepted

In the end it was ESET Smart Security 5 blocking UDP port 5355 which resulted in games + other programms losing connection with their respective servers. I tried to add that port to firewall's trusted zone but it wouldn't work. Just uninstalled it and changed to avast.

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