Lost Wifi sometimes on Lion

Hello together,

 

i have an hard Problem with my Wifi Connection - Fritz Box 7170 Up to Date.

Since the new Airport Update i lost my Wifi Connection every half Hour,

or 45 min. Had someone the Problems.

Now i use the DNS service from Norton. I phoned also with an Supervisor

of Apple he maked with me some Settings after that it works for a while.

Since the Aiport - Update from to Day i have the Problems.

 

My English is not qiet good enough for Understanding of Tecknischen.

 

Hopefull

 

stuby

 

Mac OS Lion 1072

NIS 5 up to Date

Fritz Box 7170 Last Firmware