PC NEWS: 18.104.22.168 update is out! More info here. Report bugs here
CONSOLE 1.4 NEWS: The current plan is to have Terraria: Journey's End out for Xbox and PlayStation in Q3 2021 (Jul-Sep). Switch will follow shortly afterwards. More info here. Stay up to date with console news here
MOBILE NEWS: Stay up to date with the latest mobile news here. Report mobile bugs here
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It sounds like your Truffle may be wandering off and into dangerous areas. If you have water nearby where he could drown, some lava from a farm that he could accidentally step into, or even a hellevator nearby. Try to watch where he's walking around and see if there are any obstacles that might not seem dangerous to you - but might be dangerous for a poor helpless NPC.