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Hi all! Sorry for my bad english, i am writing from Italy!

I have a problem: every 10-15 minutes, my router disconnects for about 10 seconds (i can ping the router but i can't ping and i can't navigate in the web). I called the ISP because i thought it was a provider problem, but they told me they hadn't registered lags, so the problem must be in my pc or in my router.
I tried to connect (the ISP comes via antenna) directly my pc to the cable that comes from the antenna, tried to ping for 2 hours and i had no lags, so the problem must be the router. Any advice? I already upgraded the firmware but with no results...

Router: TP-LINK TL-WR841N
Firmware Version: 3.16.9 Build 160325 Rel.62500n
Hardware Version: WR841N v11 00000000