General WIFI connection drops out

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http://androidforums.com – Hi there, Recently (2 days ago) I updated my Samsung Galaxy S2 with Android version 4.1.2. I'm able to connect to any WIFI router except the one at my work. It will connect, but when I open an Internet page or try to refresh my Twitter Timeline the connection will drop and my phone will use my 3G connection. If it takes a while to open an internet page my phone will reconnect with the WIFI untill it drops again. At my work we use a router of EnGenius. Does anyone know if these type of routers are not supported by the new Android 4.1.2? (General)