Sorry but this is the risk you take with beta software. I had issues in beta 1 and 2, but beta 7 is working great with Garmin Connect mobile. Try updating
I don't consider this related to risk - I'm a software developer and I deliberately upgrade to the betas after a period of time - not just for my own development and awareness purposes, but also so that I can test the apps out that are important to me and provide (hopefully helpful) feedback during the beta cycle.