Has the IP address for your Internet Service Provider (ISP) changed. Mine was changed after a modem reboot from a UK one to a 'BT Americas' IP address, which caused all sorts of interesting problems. Firstly a goodly number of retail sites started giving me prices in dollars, then I couldn't access sites such as BBC iplayer (wrong country). Then a lot of time controllers on my home network decided to change to EST (US Eastern Standard Time), and my keyboard declared UDI and changed to a US set up - that really confused me as despite changing the keyboard back to UK English it wouldn't. I eventually found I had to go into Time and Language settings to get back to UK English!!!