Portege R500 - network Constant interruptions

I have a Portege R500 with Windows XP (SP3 now, but same problem with SP2 and same problem before and after all reinstall them), and the network continues to interrupt. It's desperately irritating, because I work a lot of ssh connections, and almost every time the connection breaks I lose some work. The best of cases, it's that I have to log in again and continue where I was.

This happens regardless of whether I use WIFI or wired network, and sometimes little matter where I am - home, office, coffee internet, that, is not my connection. The network is interrupted every 15-30 minutes, and sometimes as I type or loading a page, while other times it seems just to occur. It is usually easy to tell when it happens, because all the ssh connections instantly hang, all my messenger connections are broken and Outlook complains that he has lost the connection to the Exchange Server. The connections Outlook and messenger do not realize anything is wrong before the connection started actually working again, which has probably something to do with TCP or ICMP messages finally get through, but it's really strange that TCP is not only address the problem transparently - the physical connection is never interrupted for long.

I guess that it probably has something to do with energy saving, but I have been unable to resolve in setting energy saving settings. Also, I have the same problem, regardless of the question of whether the laptop is powered.

(Probably?) it is not a hardware failure, because I don't have the same problem in Ubuntu Linux and memtest does not report the errors of memory. (Speaking of which, is there a memory testing tool or self test tool integrated with this laptop?).

Any suggestion would be appreciated. I tried calling the number of local support twice, but it didn't help much to get there.

Thanks a lot for this great info

Tags: Toshiba

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