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Hi,
Thank you for using our plugin!
On the Maintenance Settings page we have the section where you can choose which Posts and Pages you can exclude from displaying the Maintenance page. In order to load the list to choose from we need to query all the posts, so if you have a huge postmeta table, which WordPress loads when we query posts, you could run into this memory issue if the limit is set too low. This will happen in other places as well, it’s not really related to Maintenance.
I would suggest you increase your memory limit. It looks like it’s already 4GB so there must be a lot of data in that postmeta but I don’t have any other ideas 🙁