Well, before updating core to 8451, my server's uptime rounded 5 days up.
Then the uptime decreashed to 6-8h.
log:
...
Loading map ./maps/6092842.map
creature 89375 stopped attacking creature 89273
creature 89273 stopped attacking creature 89375
creature 89274 stopped attacking creature 89375
Aura 33 now is remove mode 0
Couldn't find the caster of the single target aura (SpellId 52372), may crash later!
mangos-worldd: ../../../src/game/SpellAuras.cpp:7248: void Aura::UnregisterSingleCastAura(): Assertion `false' failed.
=====================
52372 = Icy Touch [DK]