This morning I was somewhat amazed at 9 a.m. to get a message saying I'd done 12000 steps already. As it happened, I had done quite a lot of walking but it's a route I've done before and it can't have been more than 7500 steps at most. So either I went into a trance and walked much further than I thought, or something's gone wrong. I'm wondering whether it could have reset itself to a different step length? Has anyone encountered anything like this, and/or do you know how to check and put it right?