Last week my Polar m400 stopped charging and had to be returned for repair. Despite being outside warranty by some three months Polar have fixed it as its a well-documented issue with corrosion of the USB port. The fix is to replace the USB port and remove the rubber cover from it. I'm advised to wash it after every use and leave to air dry.
My question is how has anyone else found the reliability after having their watch repaired like this? Am in the middle of marathon training and don't want to keep having issues with the watch.