Dlink DI-624 disconnects

Problem:
DI-624 disconnects every few minutes. The problem escalates with more wireless clients, or when a BitTorrent software runs in the background.

Solution:
It seems that the issue can be resolved by simply disabling the UPnP function in the router.
Note that the router still couldn't handle high amount of simultaneous connections, so please tune your BitTorrent application accordingly.