Router wireless D-LINK 614+ sometimes disconnect itself and reconnect

I have this router well configured but sometimes the icon in windows system tray says connectivity limited or absent and after some seconds again connected, 100 Mbps. This behaviour happens quite frequently and resets any connection, for example Windows Messanger (I have to manually reconnect). Why? This router is connected in uplink to Fastweb HUG device (the device cominig from the fiber cable network).

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Frank
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