Since last week I have a strange issue when pool swimming with Forerunner 945. When I charge the watch during the night and then go for a swim in the morning, the watch doesn't measure distance. When I restart the watch everything starts working smoothly. It kind of seems as if the accelerometer wasn't working after taking the watch off the charger. I noticed this behaviour about a week ago, didn't have any issues before. I have this watch for about 2 years now, using software version 8.20, sensor hub 14.05. Did anybody have similar experience? I am not sure if it is related to recent firmware update or is my watch slowly dying on me?