Amazon introduced about a year ago a new recurring burden onto sellers using automated systems accessing the MWS API (SL is one of those systems).
It used to be that when you signed-up to an API service provider (like SL), you would grant authority to the provider just once and you were good forever and ever.
Amazon now requires sellers to renew the authorization once a year.
If your SL account has stopped updating, it is very likely because your authorization has expired. In which instance you should see the below message in the My Accounts widget of the Dashboard.
If so, please go to your SellerCentral account and re-authorize SL. Once done, SellerLegend will resume updating and will catch up any data it had missed.
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The detailed procedure is available in the knowledgebase article here.