I used Digifit with my Jarv heart rate strap for more than a year with an iPhone 5, then upgraded to iPhone 6, and found that Digifit could no longer connect with the Jarv, although another app, Heart Rate, continues to work perfectly with. Another app, PrimalBeat, continued to work wth the Jarv, although it gave erroneous reading for HRV. As a result I bought a Polar heart rate belt, but Digifit cannot connect with it, although both the Heart Rate and PrimalBear ape work perfectly with it. I like the Digifit app, but no longer can use it. Help!