Weird issue with ES groups settings

Hello Team,

We are facing some weird issue and cannot find the root cause for same.

Scenario

We have ES group, members present in group add some post and update their status from frontend.
These activities can be seen by the same person and other members in the group.
But due to some reason, this module does not show any above activities to any user for this ES group.
Please check attached image.
That says, "There are no activities here yet" but we do have activities from past days.

How we solved it
we have created ES group with following settings
1. Description - some text added (compulsory field)
2. Group Type - Invite only Group

Somehow these 2 fields reset their values.
1. Description is blank
2. Group Type is changed to Open Group
We again change these values to original and we can again we all activities.

Same thing has repeated for 2-3 times within a week. This seems to be some other issue.
We haven't done deployments or database change too.

As this issue is raised on live, we cannot share details with you.