Garmin Edge 800 - uploading issue

rando

Last couple of rides I have uploaded from my Garmin Edge 800 to Garmin Connect have lost 0.2 miles. Yesterday's ride I clocked 71 miles on the Edge 800 but when I uploaded it only said my ride was 70.8. Same again today it lost 0.2 miles when uploaded. Anyone else had this issue ?
I have raised a ticked with Garmin support but thought I would check if others had experienced this problem.