All users are kicked off the chat after some minutes. Is there a problem deactivating autokick with autokick=0?
The problem is not autokick (only inactive users are kicked and you always get a message when it happens) but a server timeout (for example on f2s). Server push needs an active process all the time, but it is terminated after some minutes. It is advisable to allow only client pull mode (activate “Allow only safe mode” in Admin / General settings).