If you cannot be active at the time, consider leaving your toon online in your own guild castle. Alts in the Gameforge castle will add to lag, and are likely to mysteriously disconnect.
Please remember that you can be in your own guild castle or a random guild castle and still receive goodies. If you choose to be in the Gameforge guild castle, please SPREAD OUT. There's tons of space in the lawn in the front and off to the sides of the walls. The more you spread out, the less likely you are to crash!