Jimbo Kern

Hi everybody. I have an issue with my 49UJ634V: Since the 5.80.10 firmware update, almost every time I switch on the TV, the wired network doesn't work. It appears as disconnected in the menu, and the only way I can get it working again is by pulling the plug and switching it completely off than on again. It worked perfectly with 4.70.xx, so I'd like to get back and downgrade. Can anybody help? Thanks in advance.