Iphone 4 (White MC604FB) Update iOs 6.0 - Wifi Problem and iphone bug when trying to unlock on call receive. Is this a known bug ?

Dear Members (and Apple Team)
I have two iphones 4 and two bugs on the white one
1/ Is the first gen (Black)
2/ Is the second gen (White MC604FB)
I both uptdated the into Update iOs 6.0 -
Bug 1 : With the white iPhone 4 i have a real Wifi Problem, as close as 5 to 7 meters from any WiFi spot, i lose the signal, where my "black" iphone at the same time and same distance shows full signal (and tested with safari.... works).
Bug 2 : Once the white iphone is in "stand by" when trying to unlock on incoming call, the touch screen works and receive the touch information, but it bugs on trying to unlock to receive the call. (very very anoying :o) have to call back almost every time.
Are those already known bugs ? Is there a fix ?
Reagrds
Alexandre

Dear Diesel
Thanks for your prompt reply.
I did restore before posting, in evry possible way. no improvment.
I have 24H ago updated to iOS 6.01. So far no more "screen jam" on incoming calls, but the wifi is still inconsistent with very poor signal strenght (compare to my black iphone 4)
PS : For information, did beleive  there was two versions of iphone 4 (In Europe ) :
1/ Is firts generation "gen" with With board MC603FB
2/ The white one for me with board MC604FB

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