If you are useing a wireless connection run a network cable to your PS3
Also try turning off search for media servers on PS3 Settings.
Check configure on your modem The exact ports that have to be open are in game manual. Check to see if Modem /router has a DMZ setting if so enable it this openes all ports forwarding .
That being said I have had more disconcts from IL2 server as of late so may be a network issue with game server
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