Problems mapping my run

[SamOxford]

Hello

For the last few weeks, every time I have gone for a run, my Fitbit hasn't been mapping it correctly. When I return, it just shows a tiny segment of my run - literally around 100m at the most. The distance says, for example, 4.03km but I know my route is nearer 5k (4.78k to be exact). It used to map it as that. What has gone wrong with it? I've done the update but it still is mapping it  incorrectly and under-reading my distance.

Thanks.

Sam

[lala2386]

over the last week or so I'm not even getting a distance or Map!!