Lost wifi connection during iTunes download

I frequently got my wifi network dropped when I try to download iOS updates or apps updates through iTune. I would lose all network connection despite the wifi signal is still strong. I need to turn off the wifi on my iMac and then turn it back on to restore the network access. I tried to switch off the antivirus scan but that didn't help neither. Does anyone have a clue?
Thanks a lot!

You might be better off posting this on a hardware or networking forum.  Even if your wi-fi signal is strong somebody else's may be stronger and messing up your reception.  It could even be you doing it to yourself if you have too many wireless things in your house all using the same channel.  Occasionally somebody new moves into our neighborhood.  I use a wireless network provide and it only needs somebody moving into an apartment across the street and setting up a router to default channel 6 and bang goes my wireless connectivity (I can't reconfigure the provider's node channels)

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    ~~~~~~~~~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~
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