: My Tag Kirium has started behaving strangely.
: The seconds hand is not moving correctly.
: Instead of a smooth sweep, the seconds hand
: moves 4-5 second intervals at a time.
: However the watch is keeping correct time.
: Why could this be happening? Am I running
: out of battery or something?
You nailed it! that's the low-battery indication! If you plan on wearing it swimming I'd send it to Pro-Time in the US (if you are in the US), or the TAG-Heuer Service facility in your country to have the battery replaced, if you don't plan on swimming with her, then any competent jeweler should be able to swap batteries for you.
-- Chuck