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I upgraded to Mountain Lion (Mac OSX 10.8.2) and ever since I cannot stay connected with my personal phone wifi. I have reduced the MTU without success. My Mac wifi can stay connected to a poor signal local area wifi irrespective of signal strenght and speed, but cannot stay connected w/o problem to my mobile hotspot - which is my primary internet connection. The primary problem is it will drop/freeze w/o rhyme or reason. Usually after 5+ minutes of use, however, sometimes it lasts longer. The problem never goes away. Because I can stay connected to poor quality wifi systems, I believe the problem focuses on AT&T's system. I have an HTC Vivid phone.
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