I have been having the same issue until I searched Google for a fix. The method for fixing this error that I found said that we should turn off our wifi or completely disconnect from the internet, and then set Internet Explorer as the default browser before reconnecting to the internet. The directions said this fix works because Combat Arms uses Internet Explorer as it's main browsing source. After doing these things my connection to the server error stopped popping up so much. I still get it sometime if I have any usb cords hooked up to my laptop, so make sure you're unplugging whatever usb devices u have plugged in until after you log into the game. Good luck!