How can I stop the wifi causing my MacBook Pro from crashing?

Hi,
It seems that my notebook is locking up completely when Mail launches and tries to grab emails.
Occasionally I boot up and the 'wifi fan' icon on the menu bar is completely white: it doesn't find the router signal automatically.
If I get the 'three arcs: full signal" on the menu bar and I surf, I can get to a few pages, then I can't get another page to load up: but the 'three arcs' are still there.
If I click on the wifi fan logo and switch off wifi, when I try to switch it back on again, it simply won't show the 4 different signals it used to give me yesterday (mine and my neighbours). This is weird as in the past I could get surfing to work again by switching off wifi and switching it back on again. Not any more. So now I have to do a restart to get wifi working again. Yuck!
I also got a complete crash when I got iTunes to download some updated apps for my iPhone.
The following may or may not be related... I've just plugged in my iPhone, and I get a window saying "A new network interface has been detected. The 'iPhone USB" network interface has not been set up. To set up this interface, use Network Preferences." I have never seen this before, but I clicked on the button and the notebook seems happy now.
I look forward to your comments and suggestions! Thanks for being there!

Use a cloud serivce like Dropbox, Box, Google Drive, etc.
Personally, I use Box and it works very well.

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