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I think after that firmware update, Wi-Fi started to become unstable. Sppecially, very unstable when Google's location service is enabled. When it's disabled connection gets dropped much less often, but usually when e.g. we go to Wi-Fi settings. More details here: http://android.stackexchange.com/questions/50569/xperia-l-c2104-unusual-behavior-when-gps-is-active/...
Anyone else experiencing this? Sony, please read that link and fix this annoying bug. Google Now for example uses that location service and I need to keep choosing between Wi-Fi and Google Now.