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* Interference from overhead power lines used to be a problem, but the modern systems have reduced this dramatically.
* All of the soft straps require periodic replacement, so you may need a new one.
=Garmin's HRM4=
Garmin has introduced an updated form factor for their heart rate monitors which makes them much less likely to chafe. I upgraded to the [https://www.amazon.com/Garmin-HRM-Run-Black-Red-Size/dp/B01708T7NA "HRM4"], and it's greatly reduced my issues.
[[File:GarminHRM4.jpg|none|thumb|300px|The HRM4 at the top, the older style Garmin HRM, and the Polar H7.]]
=Using the Polar Wearlink Strap=
You can get a fabric [http://www.amazon.com/dp/B000F7F64I Polar Wearlink Replacement Strap] that works nicely with the Garmin transmitter. However, Polar replaced the Wearlink strap with the Wearlink+, so the original design is hard to come by. (The new Wearlink+ is nearly identical to the Garmin strap and not worth the upgrade.)