Got my new MBP yesterday and it's beautiful but I seem to have an issue with its consistency over WiFi. It will be at full speed when it first connects but it will then fall away over a number of minutes to about 1/5 of the original speed which is bringing horrible pings and slow page loading. I've tried resetting my router to factory settings, changing channels, turning off security and deleting and re selecting the profile in my network settings. I have no idea what's causing it - bluetooth is also switched off as I know a number of people with 15" versions say this can cause interference. Bit of a bummer cos I can't speed test over ethernet with no ethernet port Any tips or solutions?