This is the second time in a month this has happened. I ran a route I am familiar with and my Vivoactive was giving me seemingly accurate stats along the way - distance and pace. The final distance was accurate (including pace/time) but when it sync'ed with GC, only half the map shows up. It's basically as if I started around mile 3 of 4.6. So while my stats show a 4.6 mile run, the map reflects a route that equals around 1.5 - 2 miles. The first three miles are not there.
Ideas on why this has happened twice?