LSAT, How do I check if my card has become locked? And if it's locked, how do I unlock it? Thanks.

I have been using an F&P Icon Auto for the past few years. I use SleepyHead to download the data to see it on my computer. All of a sudden it quit logging data during the night. The downloads to SleeyHead show no data for the past five nights. This happened after not downloading data for two nights....