Step by step.
If your robot is getting stuck on the pool drain and is unable to extract itself, try the following steps:
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Turn the pool filter system off for the duration of the robot cleaning cycle. The additional suction from the main drain can cause the robot to get stuck.
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There are after-market drain-assist devices that can be attached to the main drain cover that help prevent the Dolphin from getting stuck. (They can be found through an internet search.)
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If your robot has an adjustable handle: Adjust the handle to the furthest slot in the front to help the robot overcome the drain.
Source: Maytronics support. Rewritten for clarity with the same steps; the videos and illustrations are Maytronics' own.