xap.Timer issues with LCD Applet

Hi All,

Im scripting an Applet to use with my 20x4 LCD, all is working well so far except i appear to have a timer issue

the script will happily run for 5 - 10 minutes or so and then appears to just stop - occasionally the HAH becomes unresponsive - memory leak??

im not stopping or the deleting the timer at anypoint as yet, its scripted in a way that i want the timer to continuly run... perhaps this is the issue

module(...,package.seeall)
require("xap")

info = {version="1.0", description="20x4LCDInfo"}

lcdcols = 20 -- Specify for LCD Row length
fill = " " -- Char used to fill blank LCD colums
Line1 = "Waiting for Data - 1"..string.rep(fill, lcdcols - string.len("Waiting for Data - 1")) -- Sets Line Var to contain basic text until overwritten with Catch routines
Line2 = "Waiting for Data - 2"..string.rep(fill, lcdcols - string.len("Waiting for Data - 2"))
Line3 = "Waiting for Data - 3"..string.rep(fill, lcdcols - string.len("Waiting for Data - 3"))
Line4 = "Waiting for Data - 4"..string.rep(fill, lcdcols - string.len("Waiting for Data - 4"))

Unit1 = " oC" -- Customisable Units (note the space prefix)
Unit2 = " oC"
Unit3 = " Watts"
 
function init() -- Sets up 3 filters
 Filter1 = xap.Filter()
 Filter1:add("xap-header", "source", "dbzoo.livebox.Controller:1wire.1")
 Filter1:callback(catch1wire1) -- A temperature change in the filter will trigger the Catch1wire1 routine
 Filter2 = xap.Filter()
 Filter2:add("xap-header", "source", "dbzoo.livebox.Controller:1wire.2")
 Filter2:callback(catch1wire2)
 Filter3 = xap.Filter()
 Filter3:add("xap-header", "source", "dbzoo.livebox.CurrentCost:ch.*")
 Filter3:callback(catchCurrentCost)
 send2lcd("Waiting for Data") -- Test LCD at applet start
 xap.Timer(update, 10):start() -- Starts update routine timer with a 10 second interval
end

function catch1wire1()
 Value1 = xap.getValue("input.state","displaytext") -- Sets Value1 as 1Wire data
 Line1 = Value1..Unit1..string.rep(fill, (lcdcols - string.len(Value1) - string.len(Unit1))) -- Sets Line1 Var with 1Wire data (Value1) and appends Unit1, fills remaining Lcd colums with spaces
 end

function catch1wire2()
 Value2 = xap.getValue("input.state","displaytext")
 Line2 = Value2..Unit2..string.rep(fill, (lcdcols - string.len(Value2) - string.len(Unit2)))
 end

function catchCurrentCost()
 Value3 = xap.getValue("input.state","text")
 Line3 = Value3..Unit3..string.rep(fill, (lcdcols - string.len(Value3) - string.len(unit3)))
 end

function update(self) -- Timer routine
 Line4 = "        "..os.date("%H:%M") -- Sets Line 4 as basic clock
 lcdstring = Line1..Line2..Line3..Line4 -- Conbines all LCD Lines1-4 into one string ready to send to the LCD every 10 seconds
 send2lcd(lcdstring) -- Sends to LCD
 end

function send2lcd(lcdstr) -- LCD Routine
 xap.sendShort(string.format([[xap-header
{
target=dbzoo.livebox.Controller:lcd
class=xAPBSC.cmd
}
output.state.1
{
id=*
state=on
text=%s
}]], lcdstr))
end