Remember this is not a sure fire cure. We found that using the usual stock router settings, simple SSID and NO EQUAL SIGNS or such in passwords helped as we use WPA2 AES personal security.
Otherwise something like you wrote does happen.
Some call that a bug, and I think it might be. Good luck in convincing others.
I have a samsung 46" with a wireless dongle.
Only have wireless internet. The tv keeps on switching back to a non existing wired connection and then asks if i want to switch to wireless.
Very ennoying. It just needs to remember the wireless connection and stick to it.
Thanks in advance!!