Have you able to manually assign your BD-P1600 to your wireless router? One of the first things I might check would be to see if you connected to a different wireless access point.
Which applications time out? Is it Pandora, Netflix or one of the other programs that doesn't allow you to access online content?
I have had a BD1600 since April, connected to a Linksys WRT160N via wifi with a samsung wireless usb dongle. It has worked great until yesterday when my wife updated the firmware.
Now, after about 5~10 minutes of being on the network connection fails. Going into test network connection yields "unable to ping gateway" altough every other device in the house that uses this wifi point is having no problem at all.
Has anyone else seen this?