Hello, thank you for trying all of the most common fixes that are possible. What version of the client are you using, do you also experience this with other client versions? If so, I would suggest creating a CS ticket to see if there is anything further that they can do for you.

https://support-center.oasgames.com/

3.3 is the most recent version of the miniclient. Do you have access to an older version of the miniclient? I would suggest trying to see if that allows you to have a more stable experience.