Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Watch Stopped Operating in One Week; Warranty Service Issue

Worked great for a week, then watch display froze. The chest strap works fine and is compatible with the machines at our local YMCA. If that weren't the case, then I'd rate this product one star. If the watch continued operating, I'd rate this product five stars.Update Dec 10, 2009In accordance with the instructions in the HR-100C manual, I returned the unit to Omron for warranty service. The unit was returned by the USPS with an "Unable to Forward -- Return to Sender" notice. I sent a message to Omron asking for help. I'll update with their response.Update May 9 2010Omron changed their warranty service location which accounts for the RTS notice. They repaired the unit and also defrayed the shipping cost in both directions. I have no issue with the Omron warranty repair process (other than the incorrect address).