ios - Swift - Strange Sprite behaviour using accelerometer -


i'm beginner swift , have first game complete except 1 annoying issue. have sprite flies around screen, accelerometer determines x position , touching screen moves sprite screen. works 95% of time way intend, every , accelerometer stops working 30 second minute - can't find pattern , it's driving me crazy - have suggestion ? partial code below

import spritekit import coremotion  class gamescene: skscene, skphysicscontactdelegate{    var destx:cgfloat  = 0.0 var blast = skspritenode(imagenamed: "blast") var motionmanager = cmmotionmanager()  var texture1 = sktexture(imagenamed: "bat") var texture2 = sktexture(imagenamed: "batjet")    override func didmovetoview(view: skview) {  // scene setup physics      self.physicsbody = skphysicsbody(edgeloopfromrect: self.frame)     self.physicsbody!.categorybitmask = physicscategory.edge     physicsworld.contactdelegate = self     self.physicsbody!.friction = 0     self.physicsworld.gravity = cgvectormake(-0.0, -0.8)   // set player       thebat.texture = (texture1)      thebat.position = cgpoint(x: self.frame.size.width/2, y:      self.frame.size.height/2)     thebat.setscale(0.25)     thebat.physicsbody=skphysicsbody(rectangleofsize: thebat.size)     thebat.physicsbody?.affectedbygravity = true     thebat.physicsbody?.dynamic = true     thebat.physicsbody?.allowsrotation = false     thebat.physicsbody?.categorybitmask = physicscategory.bat     thebat.physicsbody?.contacttestbitmask = physicscategory.ship     thebat.physicsbody!.collisionbitmask = physicscategory.edge | physicscategory.ship      self.addchild(thebat)  // determine player x position      motionmanager.accelerometerupdateinterval = 0.1      motionmanager.startaccelerometerupdatestoqueue(nsoperationqueue.currentqueu e(), withhandler: {  (accelerometerdata: cmaccelerometerdata!, error: nserror!) in   let acceleration = accelerometerdata.acceleration   self.destx = (cgfloat(acceleration.x) * 0.75) + (self.destx * 0.25) })   override func didsimulatephysics() {  // set velocity based on x-axis acceleration  thebat.physicsbody?.velocity = cgvector(dx: destx * 600.0, dy:     thebat.physicsbody!.velocity.dy)}


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