"EcoRouteStandard" is what you have when your ecoRouteHD device is not connected to your Nuvi.
When you buy and connect the ecoRouteHD device "ecoRoute" becomes "ecoRouteHD" in Apps.
If it worked once OK, then the feature HD is enabled.
Lossing connection must be a "glitch" because it was happening to me from time to time, even when my Nuvi was still 3760.