Radio-controlled clocks

Odd! The WWVB-controlled clock (receives time sync signal at 60kHz from NIST station WWVB) suddenly began registering the sync signal; it never caught on to the station's signal before. I bought it around 4 or 5 months ago and it had not synchronized at all - not even briefly - until last night. Tonight, it caught the signal long enough (and clearly enough) to synchronize. Strange.