Xperia Arc S wifi has weak signal

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http://forum.xda-developers.com – Hello, I have bought Xperia Arc S(running 4.0.4 now) few days ago, and ran into some wi-fi issues. It's not the connect->disconnect->connect issue, that one is fixed thanks to one app (FXR WiFi fix and rescue), but there is another problem. The wi-fi signal is just too weak. its like I have to be 3 m from router to get full signal, that's ridiculous. At place where pretty much everyone other I know has decent wifi signal for me its off already. It was same with Gingerbread, maybe with marginal difference only. This is very big annoyance for me and limits the main purpose i bought n (HowTos)