I ended up putting some NPC's on avoid:
<AvoidMobs>
<Mob Name="Thrym" Entry="28243" />
<Mob Name="Thrym" Entry="29895" />
<Mob Name="Glacial Bonelord" Entry="31754" />
<Mob Name="Cultist Acolyte" Entry="32507" />
<Mob Name="Citadel Watcher" Entry="31787" />
</AvoidMobs>
Along with diminishing the porcentage to go and repair. It's been running for hours without a problem now. Cheers
<AvoidMobs>
<Mob Name="Thrym" Entry="28243" />
<Mob Name="Thrym" Entry="29895" />
<Mob Name="Glacial Bonelord" Entry="31754" />
<Mob Name="Cultist Acolyte" Entry="32507" />
<Mob Name="Citadel Watcher" Entry="31787" />
</AvoidMobs>
Along with diminishing the porcentage to go and repair. It's been running for hours without a problem now. Cheers