Here's the code causing it.

os.loadAPI("zeppelinapi")
handle = fs.open("options", "r")
options = textutils.unserialize(handle.readAll())
handle.close()

bridge = peripheral.wrap(options.bridgeside)
carriage = peripheral.wrap(options.carriagecontroller)

if not fs.exists("currtask") then
  e, msg, d, b, c = os.pullEvent("chat_command")
  words = {}
  for word in msg:gmatch('%S+') do
    table.insert(words, word)
  end
  gox = words[2]
  goy = words[3]
  goz = words[4]
  --Calculate differences in x, y, and z and store them in a table for later use
  goto = {}
  goto.x = gox - options.x
  goto.y = goy - options.y
  goto.z = goz - options.z
  handle = fs.open("currtask", "w")
  handle.write(textutils.serialize(goto))
  handle.close()
end

goto = nil
handle = fs.open("currtask", "r")
goto = textutils.unserialize(handle.readAll())
if goto.x or goto.y or goto.z ~= 0 then
  for k,pos in pairs(goto) do
    if pos ~= 0 then
      local numtype = zeppelinapi.checkpos(pos)
      if k == "x" and numtype == "pos" then
        dir = 5
        coord = "x"
      elseif k == "x" and numtype == "neg" then
        dir = 4
        coord = "x"
        elseif k == "z" and numtype == "pos" then
        dir = 3
        coord = "z"
      elseif k == "z" and numtype == "pos" then
        dir = 2
        coord = "z"
      elseif k == "y" and numtype == "pos" then
        dir = 1
        coord = "y"
      elseif k == "y" and numtype == "neg" then
        dir = 0
        coord = "y"
      end

      carriage.move(dir,false,false)

      if coord == "x" and numtype == "pos" then
        goto.x = goto.x - 1
      elseif coord == "x" and numtype == "neg" then
        goto.x = goto.x + 1
      elseif coord == "z" and numtype == "pos" then
        goto.z = goto.z - 1
      elseif coord == "z" and numtype == "neg" then
        goto.z = goto.z + 1
      elseif coord == "y" and numtype == "pos" then
        goto.y = goto.y - 1
      elseif coord == "y" and numtype == "neg" then
        goto.y = goto.y + 1
      end

      handle = fs.open("currtask", "w")
      handle.write(textutils.serialize(goto))
      handle.close()
    end
  end
else
  fs.delete("currtask")
  os.reboot()
end