Latest problem - discharging rather than charging on the charging cradle! If you look at the Garmin forums this seems to be quite a common problem. Suggested solutions include using a computer to recharge rather than the mains, making sure the contacts, including those inside the 3 pin socket plug - are clean, and one chap suggested using a clothes peg to hold the watch on the charging cradle. After some fiddling it has recharged normally, though I had to do a soft reset to get it to turn on.