Grade build fail: Heap size

Can anyone please explain to me why my grade build is failing randomly - sometimes its a success, other time it fails, in the SAME scene... What triggers this random behavior?

I have improved my heap space to 2GB already:

This is the error:

CommandInvokationFailure: Gradle build failed. C:\Program Files\Android\Android Studio\jre\bin\java.exe -classpath "D:\ProgramFiles\Unity\Hub\Editor\2018.1.2f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.0.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx2048m" "assembleRelease"

stderr[

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':packageRelease'.

  Java heap space

Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED in 49s ] stdout[ NDK is missing a "platforms" directory. If you are using NDK, verify the ndk.dir is set to a valid NDK directory. It is currently set to C:\Users\Nimrod\AppData\Local\Android\Sdk\ndk-bundle. If you are not using NDK, unset the NDK variable from ANDROID_NDK_HOME or local.properties to remove this warning.

The setTestClassesDir(File) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the setTestClassesDirs(FileCollection) method instead. The getTestClassesDir() method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the getTestClassesDirs() method instead. The ConfigurableReport.setDestination(Object) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the method ConfigurableReport.setDestination(File) instead. :preBuild UP-TO-DATE :preReleaseBuild UP-TO-DATE :checkReleaseManifest :preDebugBuild UP-TO-DATE :prepareCore110Library :prepareVuforiaWrapperLibrary :prepareReleaseDependencies :compileReleaseAidl UP-TO-DATE :compileReleaseRenderscript UP-TO-DATE :generateReleaseBuildConfig UP-TO-DATE :generateReleaseResValues UP-TO-DATE :generateReleaseResources UP-TO-DATE :mergeReleaseResources UP-TO-DATE :processReleaseManifest :processReleaseResources :generateReleaseSources :incrementalReleaseJavaCompilationSafeguard UP-TO-DATE :javaPreCompileRelease :compileReleaseJavaWithJavac UP-TO-DATE :compileReleaseNdk NO-SOURCE :compileReleaseSources UP-TO-DATE :lintVitalRelease :mergeReleaseShaders UP-TO-DATE :compileReleaseShaders UP-TO-DATE :generateReleaseAssets UP-TO-DATE :mergeReleaseAssets :transformClassesWithDexForRelease UP-TO-DATE :mergeReleaseJniLibFolders UP-TO-DATE :transformNativeLibsWithMergeJniLibsForRelease UP-TO-DATE :processReleaseJavaRes NO-SOURCE :transformResourcesWithMergeJavaResForRelease UP-TO-DATE :validateSigningRelease :packageRelease FAILED 24 actionable tasks: 11 executed, 13 up-to-date ] exit code: 1 UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.Command+WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) (at :0) > UnityEditor.Android.Command.Run > (System.Diagnostics.ProcessStartInfo > psi, > UnityEditor.Android.Command+WaitingForProcessToExit > waitingForProcessToExit, System.String > errorMsg) (at > :0) > UnityEditor.Android.AndroidJavaTools.RunJava > (System.String args, System.String > workingdir, System.Action`1[T] > progress, System.String error) (at > :0) > UnityEditor.Android.GradleWrapper.Run > (System.String workingdir, > System.String task, System.Action`1[T] > progress) (at > :0) > Rethrow as GradleInvokationException: > Gradle build failed > UnityEditor.Android.GradleWrapper.Run > (System.String workingdir, > System.String task, System.Action`1[T] > progress) (at > :0) > UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute > (UnityEditor.Android.PostProcessor.PostProcessorContext > context) (at > :0) > UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks > (UnityEditor.Android.PostProcessor.PostProcessorContext > context) (at > :0)