Votemap not working properly. 168 maps on ser

Hi :)

Sorry, my English is not good ;) Question about votemap.

After uploading on our server 168 kz_maps, votemap command is not work :(

After entering console command "votemap" server kick with error "reliable channel overflowed" either admins and players.
What's happened? Are there any restrictions in maps.ini file or maps on server?..

--
WBR, Brahma287
[ Edited ]