Android Studio 2.3.1 - editing build.gradle file causes IDE to freeze for 20 seconds (or more)

The past few days, I've experienced some unusual problems in Android Studio 2.3.1; the IDE freezes whenever I edit the build.gradle (module) file.

My Project-level gradle settings are Use default gradle wrapper (recommended)

gradle-wrapper.properties is as follows:

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip

My local Gradle version (defined by GRADLE_USER_HOME) is Gradle 3.5
Android Studio does not have a proxy server setting enabled as described in this post Android Studio gradle takes too long to build

my gradle.properties file is as follows

org.gradle.daemon=true
org.gradle.parallel=true

my build.gradle file is as follows

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    defaultConfig {
        applicationId "app.com.eventfull.waterjam"
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    dataBinding.enabled=true
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2',         {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    compile 'com.android.support:appcompat-v7:25.3.1'

    compile 'com.google.firebase:firebase-auth:10.0.1'
    compile 'com.firebaseui:firebase-ui-database:1.0.0'
    compile 'com.google.firebase:firebase-database:10.0.1'

    compile 'com.android.support:design:25.3.1'
    compile 'com.android.support:support-v4:25.3.1'
    testCompile 'junit:junit:4.12'
}

apply plugin: 'com.google.gms.google-services'

I tried toggling the offline work option in Global Gradle Settings (Settings > Preferences > Build, Execution, Deployment > Gradle), but this has no effect; IDE still hangs up when editing the build.gradle file. Thoughts?

EDITS:

Here are my custom VM OPTIONS.

-Xms512m
-Xmx2g
-XX:MaxPermSize=1024m
-XX:ReservedCodeCacheSize=240m
-XX:+UseCompressedOops

A complete un-install & re-install seems to have fixed this issue.
I dislike resorting to such measures - I'd rather know the why - but it was nonetheless effective.

UPDATES on 6.25.2017

Despite uninstalling & reinstalling Android Studio, Gradle, rebooting my system, cleaning various system caches a few times...Android Studio still freezes for ~30s to 60secs upon editing a gradle file. I've taken to editing the gradle files in an external text editor & Sync Project with Gradle Files. It helps, but Android Studio still seems to freeze intermittently for ~20secs or longer after doing this. Toggling the "offline mode" in gradle settings does nothing.

I'm using...

Android Studio 2.3.3 (for production apps)
Android Studio 3.0 canary 4 (for experimenting & ideas).
'com.android.tools.build:gradle:2.3.3' is the gradle android build tools in Android 2.3.3
Macbook Pro (Mid 2015), Core-i7, 16GB RAM, Sierra 10.12.5

Let me know if someone has any suggestions...

UPDATE 4/02/2018

The problem has disappeared since Google added a special repository for Android Studio users, that is, the embedded Maven repository for Android Studio 3+.

Android Studio 2.3.3 and lower doesn't have this.

INSTRUCTIONS

Open Android Studio's Preferences - ⌘, (mac) or CTRL ALT S (win)
search for 'embedded'
click Enable embedded Maven repository

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