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My 405 has recently started recording silly high speeds, which is preventing me from being able to tell what my real highest speed is on training runs. Looking at my mile splits from each run, it always happens in the first mile, which makes me think it's probably happening right at the start. All the rest of the functions are working fine and all the rest of the data it records seem to be accurate.
I thought it might be caused by starting the timer before it had locked in on the satellite signal, thus confusing it as to how fast I was actually going, but yesterday I made sure it was locked in and ready to go well before I started running, and it still happened.
My 'top speed' yesterday was 17mph, last week it was 243mph. Does anyone have any idea what might be going on and how to get it sorted out?