Enter Password 2X Times...Occasionally

When logging onto 1Password, a member of my 1Password Family has to enter the password twice to unlock it.  The initial password is not rejected as incorrect.  The person simply receives a second request to enter it again and then all is well.  This happens periodically at random intervals.  This is not a case where 1Password is being accessed after a long period of inactivity.  This started happening recently.  Thus far I as the account owner has not seen this problem.

Please let me know how to fix this problem.