I use a Edge 1050 for cycling, but get the HR from my FR965 so I don't have to use a HR-strap. When I start my rides I very often stop receiving HR on the Edge 1050 (especially when starting slow / downhill and have a low HR). The FR965 is still transmitting HR but it stops being received on the Edge 1050. I must stop and start the transmit from the FR965 to get it going again, this repeats approx 1-5 times before it usually works all the way until the ride is over (it's an approx 30-40min ride to work). It's not a big problem, but it's really annoying and very consistently failing.
Edge 1050 (sw 13.13) and FR965 (sw 23.20). Just updated Edge 1050 to sw 13.14, but not really expecting this to be fixed from the change log for 13.14.