Issues with internet connection.  Logic board?

I have a 17" MacBook Pro (Late 2008) 2.5 GHz Intel Core 2 Duo, serial ...GV3R9.  More often than not my internet gets disconnected.  The Wi-Fi icon indicates it is ON, but there is no connection at all.  Then if I manually turn OFF the Wi-Fi, it won't turn back ON again until I restart my computer, sometimes more than once until the internet connection is active again.  I could not identify a pattern of when the Wi-Fi turns OFF.  I suspect something could be wrong with the Logic Board, but I don't know how to diagnose it.  Any ideas?

Does this WIFI issue happen everywhere (other networks outside your home) or is it limited to your home WIFI network?  If it's just your home, then the problem is with your home router.  If the problem is everywhere, then it's suggested that you back up all your personal data and then erase and reload the OS on the laptop first and retest the wireless capabilities before loading anything back on it.  If it works fine, then it was just a borked OS load.  Restore your stuff and go from there.  If it behaves the same way, then it could be hardware related, but it's probably just the WIFI card on it and not the entire logic board.

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