Hello guys am new to this and i just found a way to fix severe server kicking which only affected the owner of the server(idk maybe anyone).
In order to fix this you need to go to your fire wall/ window defender firewall, if you have an anti virus that is managing the fire wall disable it for awhile and then proceed to the left side where you can "find Allow an app or feature through Window Defender Firewall" after clicking it you can see Allow app to communicate through Window Defender Firewall" click change settings. After that the click allow another app..." find the location of your minecraft file (i use tlauncher and i found the file which is tlauncher.exe(it may depend on what you use) at appdata inside .minecraft foulder after you add it you can now choose to private or public on the check box. i check both. after that press ok then go to your server it would say connect to the Dyn Ip which you can find on your server on aternos or they will say it to you. I Hope it helped you especially to the owner of the server who would get kicked out everytime.