If there is something and you haven't made any changes, definitely take a closer look — this could be indicative of some sort of suspicious activity on your account. (howtogeek.com)
The site sends email notification to members to keep track of activities on their account even when they are offline. (datingwebsites101.com)
As long as there's at least one qualifying activity on the account within 18 months, the miles do not expire. (rewardexpert.com)