Problem in syncing the changes into the files shared in TEAMs

There is a Private TEAMs channel in which 4 users are present.

And they are sharing excel documents in that channel and updating/merging the changes by all of them.

Sometimes, this merging is getting failed

It is becoming quite disruptive with work especially when big changes are made and we are only notified later that changes cannot be merged

Co-Authoring" feature is using and Autosave Option is enabled

Can anyone please help on this cuong 

Thank you