This is the third replacement in 2 Months. First replacement was for unresponsive back button after a year of use. After receiving the replacement watch, I updated the watch to the 11.18 software. As soon as the update went through- my heart rate monitor and all sensors related to the Sensor HUD stopped working. I submitted a request for a replacement and even offered to take a less expensive version (the surf edition) to avoid the same issues after reading a few forums that discussed the same issues with the 11.18 update. This is my third watch in two months. My watch recently received the 11.18 update and I noticed the heart rate sensor no longer worked once the update was complete. This is the second time that the sensor hud stopped working after downloading the 11.18 update. I checked the device info and the version for SNS and BMX is 0.00 as it was last time. I have read that this update has caused issues with other people as well. I received this replacement watch just three days ago. Unless you make an update that fixes this bug, I would either like my money back or a different version that doesn’t have this update.