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From Fellrnr.com, Running tips
→Fixing other problems
* Over time the Wearlink+ strap can get stiff and cut into your chest. I’ve not found a way of re-softening the strap, so it’s time for a replacement if this happens.
* A low battery can result in bad reception, and the watch does not always report a low battery condition properly.
* When replacing the battery, insert the new one upside down for a few minutes to short out the contacts. This will reset the monitor and may prevent some reception problems.
* A [http://support.garmin.com/support/searchSupport/case.faces?caseId={acd36fa0-7ac5-11e2-65d0-000000000000} factory (master) reset] of the watch may be required. I found this fixed a number of problems with my 310XT, including heart rate monitoring.
* The straps can be damaged by washing and require careful hand washing, not machine washing. If you damage a strap, it needs replacement.
* 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.
