Maybe I'm just stupid but I just had a problem start up with my Node 2 computer. All had been working fine then I went out to ride one day and the speed and distance are all wrong. I went back into setup and confirmed the wheel size and that it was set to mph. Any ideas what could be causing the problem? I should note that cadence and HR are working fine. This is being used right now on my older steel bike so it's got seperate speed and cadence sensors.