dhcp,info dhcp5 deassigned 192.168.5.8 from D4::::D3:A6
wireless,info D4::::D3:A6@out wi fi: disconnected, received deauth: sending station leaving (3)
It could be several things. To be able to answer that though, we would need a little more info. If you have one client that is doing that over and over and none of the others are, then that client has some sort of problem. It could be settings or it could be hardware failing. That is the most common reason, but there are several reasons a station might send a deauth packet.