Keep getting update notifcations despite there is nothing to update

I experienced this problem and found that W3 Total Cache was the culprit. Deactivating and reactivating the plugin cured the problem. Hat tip to this forum for the clue.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)