diff --git a/index.js b/index.js
index 79d90a3..36ea844 100644
--- a/index.js
+++ b/index.js
@@ -17,6 +17,7 @@ const constants = require('./src/constants')
 const ChannelDB = require("./src/dao/channel-db");
 const FillerDB = require("./src/dao/filler-db");
 const TVGuideService = require("./src/tv-guide-service");
+const onShutdown = require("node-graceful-shutdown").onShutdown;
 
 console.log(
 `         \\
@@ -209,3 +210,11 @@ function initDB(db, channelDB) {
     }
 
 }
+
+onShutdown("log" , [],  async() => {
+    console.log("Received exit signal, attempting graceful shutdonw...");
+});
+onShutdown("xmltv-writer" , [],  async() => {
+    await xmltv.shutdown();
+} );
+
diff --git a/package.json b/package.json
index 22d7a59..a5498d0 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
     "angular": "^1.7.9",
     "angular-router-browserify": "0.0.2",
     "angular-vs-repeat": "2.0.13",
+    "random-js" : "2.1.0",
     "axios": "^0.19.2",
     "body-parser": "^1.19.0",
     "diskdb": "^0.1.17",
@@ -26,6 +27,7 @@
     "node-ssdp": "^4.0.0",
     "request": "^2.88.2",
     "uuid": "^8.0.0",
+    "node-graceful-shutdown" : "1.1.0",
     "xml-writer": "^1.7.0"
   },
   "bin": "dist/index.js",
diff --git a/src/helperFuncs.js b/src/helperFuncs.js
index aaffd4c..37f3efe 100644
--- a/src/helperFuncs.js
+++ b/src/helperFuncs.js
@@ -6,6 +6,9 @@ module.exports = {
 
 let channelCache = require('./channel-cache');
 const SLACK = require('./constants').SLACK;
+const randomJS = require("random-js");
+const Random = randomJS.Random;
+const random = new Random( randomJS.MersenneTwister19937.autoSeed() );
 
 function getCurrentProgramAndTimeElapsed(date, channel) {
     let channelStartTime = (new Date(channel.startTime)).getTime();
@@ -102,7 +105,7 @@ function createLineup(obj, channel, fillers, isFirst) {
                 //it's boring and odd to tune into a channel and it's always
                 //the start of a commercial.
                 let more = Math.max(0, filler.duration - fillerstart - 15000 - SLACK);
-                fillerstart += Math.floor(more * Math.random() );
+                fillerstart +=  random.integer(0, more);
             }
             lineup.push({   // just add the video, starting at 0, playing the entire duration
                 type: 'commercial',
@@ -152,12 +155,7 @@ function createLineup(obj, channel, fillers, isFirst) {
 }
 
 function weighedPick(a, total) {
-    if (a==total) {
-        return true;
-    } else {
-        let ran = Math.random();
-        return ran * total < a;
-    }
+    return random.bool(a, total);
 }
 
 function pickRandomWithMaxDuration(channel, fillers, maxDuration) {
diff --git a/src/plexTranscoder.js b/src/plexTranscoder.js
index 00663a1..11f3def 100644
--- a/src/plexTranscoder.js
+++ b/src/plexTranscoder.js
@@ -182,7 +182,7 @@ lang=en`
         try {
             return this.getVideoStats().videoDecision === "copy";
         } catch (e) {
-            console.log("Error at decision:" + e);
+            console.log("Error at decision:", e);
             return false;
         }
     }
@@ -199,7 +199,7 @@ lang=en`
         try {
             return this.getVideoStats().videoDecision === "copy" && this.getVideoStats().audioDecision === "copy";
         } catch (e) {
-            console.log("Error at decision:" + e);
+            console.log("Error at decision:" , e);
             return false;
         }
     }
@@ -245,7 +245,7 @@ lang=en`
                 }
             }.bind(this) )
         } catch (e) {
-            console.log("Error at decision:" + e);
+            console.log("Error at decision:" , e);
         }
 
         this.log("Current video stats:")
@@ -313,7 +313,7 @@ lang=en`
 
     async getDecision(directPlay) {
         try {
-            this.getDecisionUnmanaged(directPlay);
+            await this.getDecisionUnmanaged(directPlay);
         } catch (err) {
             console.error(err);
         }
diff --git a/src/xmltv.js b/src/xmltv.js
index d1596be..6d738b2 100644
--- a/src/xmltv.js
+++ b/src/xmltv.js
@@ -1,11 +1,29 @@
 const XMLWriter = require('xml-writer')
 const fs = require('fs')
-const helperFuncs = require('./helperFuncs')
-const constants = require('./constants')
 
-module.exports = { WriteXMLTV: WriteXMLTV }
+module.exports = { WriteXMLTV: WriteXMLTV, shutdown: shutdown }
 
-function WriteXMLTV(json, xmlSettings, throttle ) {
+let isShutdown = false;
+let isWorking = false;
+
+async function WriteXMLTV(json, xmlSettings, throttle ) {
+    if (isShutdown) {
+        return;
+    }
+    if (isWorking) {
+        console.log("Concurrent xmltv write attempt detected, skipping");
+        return;
+    }
+    isWorking = true;
+    try {
+        await writePromise(json, xmlSettings, throttle);
+    } catch (err) {
+        console.error("Error writing xmltv", err);
+    }
+    isWorking = false;
+}
+
+function writePromise(json, xmlSettings, throttle) {
     return new Promise((resolve, reject) => {
         let ws = fs.createWriteStream(xmlSettings.file)
         let xw = new XMLWriter(true, (str, enc) => ws.write(str, enc))
@@ -59,7 +77,9 @@ function _writeChannels(xw, channels) {
 
 async function _writePrograms(xw, channel, programs, throttle) {
     for (let i = 0; i < programs.length; i++) {
-        await throttle();
+        if (! isShutdown) {
+            await throttle();
+        }
         await _writeProgramme(channel, programs[i], xw);
     }
 }
@@ -117,8 +137,25 @@ async function _writeProgramme(channel, program, xw) {
 function _createXMLTVDate(d) {
     return d.substring(0,19).replace(/[-T:]/g,"") + " +0000";
 }
-function _throttle() {
+function wait(x) {
     return new Promise((resolve) => {
-      setTimeout(resolve, 0);
+      setTimeout(resolve, x);
     });
 }
+
+async function shutdown() {
+    isShutdown = true;
+    console.log("Shutting down xmltv writer.");
+    if (isWorking) {
+        let s = "Wait for xmltv writer...";
+        while (isWorking) {
+            console.log(s);
+            await wait(100);
+            s = "Still waiting for xmltv writer...";
+        }
+        console.log("Write finished.");
+    } else {
+        console.log("xmltv writer had no pending jobs.");
+    }
+}
+