There are many way that may cause you from disconnecting from your online game.
It may be your internet wire/cable have rust or lossen.
It also can be the server of the online game is under maintanence.
if the wire/cable of your Boardband is lossen, you can either change your cable/wire
or use a tape to stick it. If the cable/wire is rusted, u should change a new one.
If you have done all of the above and still experiencing disconnection, do this following instruction.

Switch the cable that is connected to your Boardband to other holes found on the side.
After that, switch off your internet and restart your computer.
Do this plus the above instruction should cure your disconnection and lagging in your online game. *Warning. Please becarful of electricity*