Crashes (tibia not responding) seem to be totaly random, I even got the crash when I logged out my char for HOURS, and all of a sudden the client crashes, while no char online on that tibia client, scripts were still running tho cuz obviously I didnt close the client! (happend like 3x now with different scripts)
Since I always got alot of scripts executed it could be anything, custumized healer (dont mana if monster on screen but pump mana when all dead), or demonic blood user, loot HUD's, soft boots equiper etc