Tier ‘downgrades’ happen when you don’t earn enough points to maintain the tier.
Refer to the chart. For example, if you earn enough points to achieve Platinum tier in Reward Period 1 (1 Jan – 30 Jun), you will continue to maintain Platinum status until the end of Reward Period 2 (31 Dec).
Scenario 1: If you continue to earn enough points for Platinum in Reward Period 2 (1 Jul – 31 Dec), you will maintain your tier in the next period starting 1 Jan.
Scenario 2: If you do not earn enough points for Platinum in Reward Period 2 (1 Jul – 31 Dec), your tier will be downgraded to match your points earning in Reward Period 2.
When you lose a tier status, you also lose all privileges that come with it.