Accuracy of calories burned while biking

[OakLeaf]

Yes..it is the premium soft strap...which means what exactly? Are these straps known to cause inaccurate readings?

Yep. Known to lose contact if you're too wet, too dry, wearing the wrong kind of fabric ... I've got the old hard strap so I don't really know the ins and outs and whether there's much you can do short of replacing it, but take a look at the Garmin user forums.