S60 software crash or charging problem

  1. recently updated my course slope ratings on my garmin s60 , when playing next round of golf the watch kept crashing , moving out of the golf mode to watch mode. Blue triangle appeared on one occasion and went into demo mode. I kept playing golf but never saved the round due to multiple stop/starts. Later that day I plugged in for charging and checked later to findn watch screen had switched off. Cleaned charging points and tried charging , swapped power outlets but nothing. Watch is not powering up. Nor sure if this was software crash or this just battery related problem. Watch is two years old  so out of warranty any suggestions.