It seems that my sensors on the 520 consistently drops when I have my Fenix3 connecting via bluetooth at the same time. Somehow the Fenix3 stays connected to all the sensors, but the 520 goes away (dropping power/cadence, HRM, speed sensor and bluetooth).
I was able to repeat this during a support call with Garmin today.
1. Edge 520 connected to all sensors.
2. Turn on Fenix3's bluetooth.
3. When Fenix's bluetooth connects, all sensors for 520 goes away.
When I turn off bluetooth on the Fenix, the 520 connects back again. I'm using an iPhone 5s running iOS 9.0.1. Happened running iOS 9.0 as well.
Could some of you also have another Garmin or bluetooth device that could be interfering?
I was also told by the support rep that there are known issues with the HRM Run and 520. I've dug up an old non-run HRM to use with my 520 for now.
My workaround is to not use my Fenix3 at the same time as the 520.
Art
Not much good restarting the 520 when you are in the middle of a Zwift session on a smart trainer. Whatever these drop-outs are I hope Garmin has fixed in their later models. Otherwise, I'm going to Wahoo.
I have a Fenix 5s; During my indoor ride the speed sensor keeps kicking off. I have tried everything; even replaced the sensors and batteries.. Any suggestions????
I bought a 520plus and a varia315 two weeks ago to replace a 705 and right away it started to loose all sensor connections, both Ant+ and BT, at some 15-30 minute intervals. It usually reconnects after 10-30 sec but occasionally it can take several minutes. It happens at different locations each time so can not be interference related. It's something in the 520's program that crashes.