Instinct 2s open water swimming GPS track very wrong but distance correct

Following an update to 15.08 my open water GPS swimming tracks are completely wrong, just a straight line, covering about 5 metres of distance even though the swim is 750m around a lake.  This only happens for open water swimming, the GPS track for cycling, trail running and windsurfing is accurate and the distance is correct too. On my last swim I waited after selecting open water swimming for the GPS icon to show a tick, then entered the water.   I'm very puzzled as the GPS must be working to show the other event tracks.   If I use Strava to 'correct distance' ( which reads correctly ) it uses the swim GPS data to correct distance to the wrong amount, a 750m swim becomes 5m.  So, any ideas?

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