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Q: Macbook Pro dropping WiFi connection when viewing YouTube videos.
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Jun 25, 2013 6:28 AMby sterling r,Howdy Old Rusty Bucket,
Here are a few things that I feel may help resolve the issue you are experiencing.
First if your OS version showing in your post is accurate, then update to 10.7.5 with software update.
OS X: Updating OS X and Mac App Store apps
http://support.apple.com/kb/ht1338
Then I recommend resetting Safari:
Safari 5.1 (OS X Lion): Reset Safari
http://support.apple.com/kb/PH5043
Resetting the PRAM:
About NVRAM and PRAM
http://support.apple.com/kb/ht1379
Reset the SMC:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
and lastly try performing a Safe Boot:
Mac OS X: What is Safe Boot, Safe Mode?
http://support.apple.com/kb/ht1564
All the very best,
Sterling
