突然、AndroidStudioのプロジェクトsync時にエラーがでるようになった

お世話になっております。
本日の昼ごろまで何事もなくコンパイルできていたプロジェクトが
突然プロジェクトをSyncするだけでエラーがでるようになりました。

Gitの変更内容を確認しても何も変更ありませんでした。
突然のことでどのように解決をすればよいのかわかりません。

とりあえずは、オフラインモードで実行すれば現在のアプリの実行はできるようなので
一旦、それで急場をしのいでおります。
なにか解決方法がわかる方いましたら、ご教示いただけませんでしょうか？

以下、開発環境、及び、エラー内容と、各種Build.gradle内容です。

■開発環境

Mac OS 10.14.6（Mojave)
Android Studio 3.5.3

■Projectのbuild.gradle

buildscript {
    repositories {
        google()
        jcenter()
        maven {
            url 'https://maven.fabric.io/public'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.2'
        classpath 'com.deploygate:gradle:2.0.1'
        classpath 'com.google.gms:google-services:4.3.3'
        classpath 'io.fabric.tools:gradle:1.28.1'
        classpath 'com.google.firebase:perf-plugin:1.3.1'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven {
            url 'https://github.com/yanzm/LoopViewPager/raw/master/maven-repo'
        }
        maven {
            url 'https://maven.google.com/'
        }
        maven { url 'http://plaidev.github.io/karte-tracker-android/maven-repo' }
        maven { url 'https://jitpack.io' }
    }
}

■Moduleのbuild.gradle

apply plugin: 'com.android.application'
apply plugin: 'com.google.firebase.firebase-perf'
apply plugin: 'deploygate'
apply plugin: 'io.fabric'


android {
    compileSdkVersion 28
    buildToolsVersion '29.0.2'
    useLibrary 'org.apache.http.legacy'

    lintOptions {
        checkReleaseBuilds false
        abortOnError false
    }

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 28
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
        vectorDrawables.useSupportLibrary = true
    }


    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

（中略）

dependencies {

（中略）

    implementation 'com.google.firebase:firebase-core:17.2.1'
    implementation 'com.google.firebase:firebase-firestore:21.3.1'
    implementation 'com.google.firebase:firebase-messaging:20.1.0'
    implementation 'com.google.firebase:firebase-appindexing:19.0.0'
    implementation 'com.google.firebase:firebase-perf:19.0.3'
    implementation 'com.google.firebase:firebase-config:19.0.4'
    implementation 'com.google.android.gms:play-services-tagmanager:17.0.0'

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

}

■エラー内容

root project:root project 'app'Dependency resolved to an incompatible version: Dependency(fromArtifactVersion=ArtifactVersion(groupId=com.google.firebase, artifactId=firebase-messaging, version=20.1.0), toArtifact=Artifact(groupId=com.google.firebase, artifactId=firebase-iid), toArtifactVersionString=[20.0.2])

FAILURE: Build failed with an exception.

* What went wrong:
In project 'sample' a resolved Google Play services library dependency depends on another at an exact version (e.g. "[20.0.
2]", but isn't being resolved to that version. Behavior exhibited by the library will be unknown.

Dependency failing: com.google.firebase:firebase-messaging:20.1.0 -> com.google.firebase:firebase-iid@[20.0.2], but fire
base-iid version was 20.0.1.

The following dependencies are project dependencies that are direct or have transitive dependencies that lead to the art
ifact with the issue.
-- Project 'sample' depends onto com.google.firebase:firebase-core@17.2.1
-- Project 'sample' depends onto com.google.firebase:firebase-config@{strictly 19.0.4}
-- Project 'sample' depends onto com.google.firebase:firebase-perf@19.0.3
-- Project 'sample' depends onto com.google.firebase:firebase-messaging@{strictly 20.1.0}
-- Project 'sample' depends onto com.google.firebase:firebase-core@{strictly 17.2.1}
-- Project 'sample' depends onto com.google.android.gms:play-services-measurement-api@{strictly 17.2.1}
-- Project 'sample' depends onto com.google.firebase:firebase-analytics@{strictly 17.2.1}
-- Project 'sample' depends onto com.google.firebase:firebase-messaging@20.1.0
-- Project 'sample' depends onto com.google.firebase:firebase-iid@{strictly 20.0.1}
-- Project 'sample' depends onto com.google.firebase:firebase-config@19.0.4
-- Project 'sample' depends onto com.google.firebase:firebase-perf@{strictly 19.0.3}

For extended debugging info execute Gradle from the command line with ./gradlew --info :bod:assembleDebug to see the dep
endency paths to the artifact. This error message came from the google-services Gradle plugin, report issues at https://
github.com/google/play-services-plugins and disable by adding "googleServices { disableVersionCheck = false }" to your b
uild.gradle file.

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

このエラーを受けて、com.google.firebase:firebase-iid@[20.0.2]のライブラリを追加すればよいのかと思い、

    implementation 'com.google.firebase:firebase-iid:20.0.2'

をModuleのbuild.gradleに追加して再度sync実行してみたのですが、
今度は、

FAILURE: Build failed with an exception.

* What went wrong:
Could not resolve all dependencies for configuration ':bod:liveDebugRuntimeClasspath'.
> Could not determine artifacts for com.google.firebase:firebase-iid:20.0.2
   > Could not get resource 'https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-iid/20.0.2/firebase-iid-20.0.2.aar'.
      > Could not HEAD 'https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-iid/20.0.2/firebase-iid-20.0.2.aar'.
         > Remote host closed connection during handshake

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

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
ERROR: SSL peer shut down incorrectly

のエラーがでるようになりました。
ブラウザで
https://dl.google.com/dl/android/maven2/com/google/firebase/firebase-iid/20.0.2/firebase-iid-20.0.2.aar
をアクセスすると、aarをダウンロードしに行くのでurl自体は存在するようですが、公開されてはいないということでしょうか？

同じような現象が起きた方、解決方法を知っている方がいましたらどうかご教示いただけませんでしょうか？
よろしくお願いします。