Hi Japhy,
Thanks for following up, and I understand not being able to share the file. Would the team project file you’re working with happen to be particularly large, or does the project have widget/interaction heavy pages? You mentioned that other files weren’t being affected, so this issue could be coming down to something specific to this team project.
Also, are you experiencing any slowness while checking in/out or getting/sending changes in this project as well? In this case, does getting a new local copy of your project help at all? You can find the steps for how to do that here. Let me know if you have any questions in the meantime!