Client keeps disconnecting from server in every kind of testing

[yoonjou (Dicomu)]

1. What I want to achieve
   I want to test my experience successfully in my Roblox Studio

2. What is the issue?
   While performing the test, the client keeps disconnecting from the server in any testing(Play, Local Server, Team Test). No exceptions, it was always disconnected.
   Though it often happens at some point(location) in the experience, sometimes it also happens at any other points. Maybe it is related to the streaming system?
   
   

   
   
   
   
   
   
   Says, “Disconnected to the Team Test server.”
   The testing window closes if I click that blue button(Okay).

3. Solutions I have tried so far
   I searched for DevForum and Google and tried to get help from my other developer friends, but there were no significant results.
   I also tried reinstalling Roblox Studio, restarting my PC…
   Downloaded as a local file, played, and disconnected.

I have an emergency bug to fix in my experience, which needs to be fixed quickly, but I cannot debug it because I cannot even test my experience properly.
Please let me know if you need additional information to answer. I will give as much information as possible.

Also, please give me any advice on this article, because I am new to DevForum and not even good at English.