I am regularly loosing the heart rate signal on my Garmin Fit app on iPhone 4.
I have the "premium heart rate monitor", an ANT+ adapter, iPhone 4 (iOS 7.1.1), Garmin Fit 1.6.
Typically my heart graph graph shows 4 to 5 data loss during each training. I think I tried everything: tighten the strap, wet the electrodes and contact patch, replace the battery, install latest soft versions,... At the end, I sent the heart rate monitor and the ANT+ adapter back to Garmin, they were replaced, but without any improvement....
Any idea what I should do ?