IMac Stops Using the Internet Connection

While browsing, my iMac will suddenly stop communicating with the internet. AirPort, Chrome, and all Mac software are working fine, it just "forgets" how to connect. It shows everything is as it should and is still connected to my home network, but won't operate at all. The only solution is to reset from Time Machine. Anyone else have this problem?

Best way ti fix it !
iMac and MacBooks have the  ( PHY Mode:    802.11n ) as standard
there not supporting 802.11g or other types
what you need to do
go About this Mac  > More Info... > Overview > Than > System Report..
Than from the lest under Network - Wi-Fi
you will get report about your network Interfaces ,
your router name here  :
  PHY Mode:    802.11n
  BSSID:    bc:76:70:5d:c6:a7
  Channel:    7
  Country Code:   
  Network Type:    Infrastructure
  Security:    WPA2 Personal
  Signal / Noise:    -74 dBm / -101 dBm
  Transmit Rate:    52
make sure that your router setting on your router match the machine
in example the router set on : Mode:    802.11n only !
and Security:    WPA2 Personal
after that you mac will work faster and smooth
why is that happened ?
when your router set in auto mode , if any other pc or laptop join the network the router will change the mode from 802.11n than your mac will lose the connection setting and you will need to refresh the network
agin and agin and agin .
make sure you buy good router that support 802.11n
very easy job takes me 1 year for find it and no one have the right answer on the net

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    what you need to do
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    your router name here  :
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