If you're handling tons of data, then consider using Microsoft Graph pagination and then give a try to see if it helps. You may be the facing the above issue may be due to that as well. It's the recommendation and a best practice that i can suggest here.
MS Teams conversation/message created by MS Graph REST API could not completely load by Teams mobile app
We used MS Graph REST API to create conversations and messages (over 20000 messages) in Team's private channel at 14 Jan 2021 at once, and then create a few conversations and messages to the same channel again at 18 Jan 2021. All the conversations and messages can be loaded successfully at Teams desktop application (Win10) and Teams on the web, but cannot load the conversations and messages by Teams Android app and iPhone app.
The API we used as below:
Create channel message: https://graph.microsoft.com/beta/teams/{0}/channels/{1}/messages
Reply message: https://graph.microsoft.com/beta/teams/{0}/channels/{1}/messages/{2}/replies
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Deva-MSFT 2,266 Reputation points Microsoft Employee
2021-03-25T16:15:53.253+00:00