Hi All, so i upgraded to 4.9.0 and the wifi signal and performance is a lot worse than 4.8.3, i have change wifi settings to GB-UK but still no better, speeds are a 3rd of the speed on 4.9.0 and signal near the router has gone from -30db to -50db in the same location, any fix for this or just go back to 4.8.3 as with 4.8.4, i guess from what has been advised this is what it is going to be like now?