Disconnect: client left game (steam auth ticket has been canceled)

[-Deaths_Shadow-]

I have setup a TF2 MvM dedicated server on an old computer running windows XP the server seems to run good during game play but once the game is over and it loads a new map everyone on the server gets disconnected including me. this is the message that is displayed Disconnect: client left game (steam auth ticket has been canceled).

I have no problem reconnecting to the server and playing the next map but its annoying to have to reconnect every time and most people don't rejoin. Does anyone have any ideas on what could be causing this?

I thought I should add that I start my server using a batch file. My start up command below.

srcds.exe -console -game tf -autoupdate +hostip 75.135.233.77 -ip 192.168.0.103 -secure +hostport 27015 +clientport 27005 +exec server.cfg +maxplayers 32 +sv_pure 1 +map mvm_rottenburg

I know its a little messy but this is my server.cfg file

// General Settings //

hostname Shadows Server TF2 Man vs Machine
sv_visiblemaxplayers 10
mp_maxrounds 10
host_framerate 0
setpause 0
sv_pure 1
sv_pausable 0
sv_lan 0
sv_consistency 1
sv_stats 1
//sv_password *****
//sv_setsteamaccount *****
sv_tags mvm
sv_steamgroup *****
exec banned_user.cfg
exec banned_ip.cfg
writeid
writeip
sv_contact *****
sv_region -1
rcon_password *****
sv_rcon_banpenalty 10
sv_rcon_maxfailures 10
log on
sv_log_onefile 0
sv_logfile 1
sv_logbans 1
sv_logecho 1
fps_max 600
sv_minrate 0
sv_maxrate 20000
sv_minupdaterate 10
sv_maxupdaterate 66
sv_allowupload 1
sv_allowdownload 1
net_maxfilesize 100
mp_autoteambalance 1
//mp_autoteambalance_delay 60
//mp_autoteambalance_warning_delay 30
mp_teams_unbalance_limit 1
mp_enableroundwaittime 1
mp_bonusroundtime 8
mp_restartround 0
mp_stalemate_enable 0
mp_stalemate_timelimit 300
mp_timelimit 35
mp_forcecamera 0
mp_allowspectators 0
mp_footsteps 1
sv_cheats 0
sv_timeout 900
mp_idlemaxtime 15
mp_idledealmethod 2
decalfrequency 30
sv_voiceenable 1
sv_alltalk 0
mp_chattime 10
// tf_birthday 1

// ADDED

//Setry Buster Drop Money

//Cash size = medium, small, large, random
//sm_sbdm_cashsize random
//how much cash will spawn
//sm_sbdm_cashamount 100
//sm_sbdm_enable enable


//sm_reserve_kicktype 0
tf_mvm_min_Players_to_start 2
heartbeat
tf_mm_servermode 2
tf_mm_strict 0
sv_allow_votes 1
sv_vote_issue_nextlevel_allowed 1
sv_vote_issue_changelevel_allowed_mvm 1
sv_vote_issue_changelevel_allowed 1
sv_vote_issue_scramble_teams_allowed 1
sv_vote_issue_restart_game_allowed 1
sv_vote_issue_nextlevel_choicesmode 1
sv_vote_issue_nextlevel_allowextend 1
sv_vote_issue_nextlevel_prevent_change 1
sv_vote_issue_mvm_challenge_allowed 1
sv_vote_ui_hide_disabled_issues 1
//maxplayers 32
//hostport 27015
//clientport 27005
matchmakingport 27025
//ip *****
//hostip *****