Can't connect after installing MediaManager and upgrading

[Saiko]

Hi,

bought a new 37PFL6007K/12 this weekend. Connected to network via wireless, played YouTube etc., everything seemed to work just fine. Then installed MediaManager+Server from Philips support, tried a bit, seemed to work OK. Then installed a Software Upgrade. Afterwards I am not able to connect to network and Smart TV anymore. I choose my WiFi network, enter a password, get a message that TV is connected to my wireless network, press "Finish" and then either of two things happens:
- either I immediately get a note "The connection is lost" and I'm returned back to network configuration;
- or TV Smart menu opens, but in a couple of seconds the same scenario - connection is lost and I'm returned back to network configuration.

It seems that TV keeps dropping connection every time it connects after a couple of seconds.

Tried to uninstall this MediaManager, reseted router, TV etc. No changes. Is there any solution to this problem?

[Saiko]

BTW, yesterday connected my TV via LAN cable to router and everything was just perfect. Connection was ok. Any ideas?