I finally upgraded my old 305 to a new FR 230 as I'm starting a heart rate training program and wanted something a little higher tech. Well, it worked fine the first couple of runs but now, after running about 20 minutes, it loses my HR. Every time! The strap hasn't moved and I wet it before putting it on. I'm using the strap that came with the 305 and never used until now. I replaced the battery and checked the settings on the 230. I can't seem to find an answer anywhere else so I thought I'd ask here. Any ideas? :confused:
Do you have a mobile handset or tablet that supports ANT+ connectivity? If so, I suggest you download one of numerous free apps for it that will read from an/your ANT+ chest strap heart rate monitor, and see if the readings also drop out in that after 20 minutes, to isolate the cause to either your FR230 or the HRM itself.
