Creating a maintenance schedule and applying it to a policy on a custom group results in the objects inside the group in bouncing in and out of the maintenance schedule as well.
Aria Operations 8.18.0
Aria Operations 8.18.1
Aria Operations 8.18.2
A bug has been identified that causes the objects to leave the group improperly. Then, once the group updates its membership, the objects are re-added to the group resulting in the cycle repeating itself.
A solution will be provided with a future revision of Aria Operations.