A bit late for you but I found that my Vivosmart HR was still incorrect after I had manually entered the number steps / distance (30-40% over estimated distance).
I then edited the number of steps very slightly (I mean changing it from 5856 to 5865, so not a substanitial change) and for whatever reason that registered with the device and my run this morning was only out by 0.5% vs my iPhone.
I have just returned to running after a 4-week injury break after developing shin splints. I have had my gait video-analysed and have a brand spanking new pair of trainers.
However, now whenever I run after about 5mins I get a sharp stabbing pain inside my knee every time my right foot lands. It starts off as just a little niggle but after 1 minute the pain stops me running.
I have no pain when walking straight afterwards, but it does return a little when I go down steps.
Any ideas what's causing this and what I can do to stop it???