Server Crashing

Hey! I was running my own server today and I got this error all the time:

[4856838b][net]: sendto error -1 ffffffff
[4856838b][net]: sendto error -1 ffffffff
[4856838b][net]: sendto error -1 ffffffff
***continues for seconds*
[4856838b][net]: sendto error -1 ffffffff
[4856838b][net]: sendto error -1 ffffffff
[4856838b][net]: sendto error -1 ffffffff
[4856838c][conn]: hitch 691
[4856838d][conn]: hitch 1255
[48568391][conn]: hitch 3158
[48568393][net_server]: client dropped. cid=0 reason="no reason given"
[48568393][chat]: *** Jaldin has left the game
[48568393][net]: sendto error -1 ffffffff
[48568393][game]: leave player='0:Jaldin'

The server gives a connection error to the players..

My server cfg:

sv_bindaddr 
sv_external_port 0
sv_gametype ctf
sv_high_bandwidth 0
sv_instagib 1
sv_instagib_bouncedmg 1
sv_instagib_dmg 1
sv_instagib_explode 0
sv_kills_send 1
sv_map ctf2
sv_map_reload 0
sv_maprotation 
sv_max_clients 12
sv_motd 
sv_name ImMortallity Server [MOD]InstaGib[/MOD] Lost CTF Server
sv_port 8303
sv_powerups 1
sv_protect 2
sv_rcon_password *
sv_register 1
sv_rounds_per_map 1
sv_scorelimit 600
sv_spamprotection 1
sv_spectator_slots 0
sv_spree 1
sv_spree_method 1
sv_teamdamage 0
sv_timelimit 15
sv_tournament_mode 0
sv_warmup 0

How comes?