I have been using the chest strap monitor with my TomTom Spark/Runner 2 since mid January. For the first 6 weeks it worked fine. Then it started to give faulty heart rate readings. It spikes real high and drops real low during a run. Usually after a mile or so it straightens out, but not always. I changed the batteries and I still have issues. I have wet the strap contacts and that does not help. It occurs whether I am indoors on the treadmill or outside running on a trail, so I don't think it has anything to do with interference. Anyone else dealing with this? Any suggestions on how to fix this?
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You may also want to try a factory reset of the watch just in case it is a firmware issue. It won't hurt to try. To do a factory reset, make sure the Connect software is running and dock the watch to your computer. The Connect window will open; press the gear at the top right and select Factory reset from the next screen. Follow the steps provided, giving the watch the same name and using the same email address. When prompted to register or sign in to MySports, select sign in and use your existing account credentials. It is fairly straightforward and should take less than 5 minutes.
I hope this helped answer your question. If so, please mark it as a solution so others can look for it if they have the same question.