Are wi-fi issues MBA or Lion? Anyone changed WEP to WPA?

I have 3 Macbooks in the house. The only one having connectivity issues is my new Air - connection goes in and out. At home, I have WEP security. At work, I never have connectivity issues - it's WPA security. I'm wondering if anyone has made this switch and if it helped.  There is much debate whether the problem is Air or Lion related.  But seems that more AIr people are complaining.  I'm also wondering if my best solution is an Airport.  THoughts?

I changed my 2wire modem to WPA and the difference was immediately noticeable.  I did this at the suggestion of an AppleCare tech guy who mentioned something along the lines of 'Lion is designed to work with a WPA protocol'. I can't quite remember but it was something to that effect. Anyway the point is, it worked. And while I still do get disconnected on occasion it's nowhere near as often as it was with WEP.

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