It's not totally uncommon. I have a Waveceptor and several other clocks that use WWVB. One works perfectly, most of the others are usually good, one gets off

It's not totally uncommon. I have a Waveceptor and several other clocks that use WWVB. One works perfectly, most of the others are usually good, one gets off a couple of times a year (so therefore useless), and my Waveceptor has gone nuts maybe a couple of times. It seems to be all about signal strength (and a little bit about battery strength). I see at least one of those watches has GPS reception.