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It sounds as though perhaps there's something in your account/region, unknown to you so far, that is manipulating ENIs frequently. I would recommend enabling CloudTrail and checking the activity logs for EC2 AttachNetworkInterface actions. A high request rate could result in the symptom you're describing.
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You can then make a request for a limit increase via support.
I have CloudTrail enabled with API access set to All, and the AttachNetworkInterface event is missing. In the RunTask event with the EventBridge identity, I do see the response: the task's launchType is FARGATE and the ENI's state is PRECREATED.