Android Studio）soundPoolを使用するとアプリが停止する

■現状
Android Studioでアプリを制作しています。

■問題
soundPoolを.playSound()しようと試みるとアプリが停止する場合があります。

・Nexus 4(API 22)　→　正常動作
・Pixel C (API 22) →　アプリが停止

■エラーメッセージ
エラーメッセージを見るとaudio関連のエラーが散見されますが、
改善策などご教授頂ければ幸いです。
build.gradleのminSDKは21です。

04-03 01:55:02.125 1145-1145/? E/EGL_emulation: tid 1145: eglCreateSyncKHR(1865): error 0x3004 (EGL_BAD_ATTRIBUTE)
04-03 01:55:02.224 1525-1627/system_process E/InputDispatcher: channel '3d0231a4 co.jp.sabtest/co.jp.sabtest.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
04-03 01:55:29.442 9398-9398/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-03 01:55:29.442 9398-9398/? E/android.os.Debug: failed to load memtrack module: -2
04-03 01:55:31.310 9415-9415/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-03 01:55:31.310 9415-9415/? E/android.os.Debug: failed to load memtrack module: -2
04-03 01:55:47.204 9426-9426/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-03 01:55:47.204 9426-9426/? E/android.os.Debug: failed to load memtrack module: -2
04-03 01:55:47.816 9438-9438/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-03 01:55:47.816 9438-9438/? E/android.os.Debug: failed to load memtrack module: -2
04-03 01:55:48.420 9451-9451/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-03 01:55:48.420 9451-9451/? E/android.os.Debug: failed to load memtrack module: -2
04-03 01:55:48.985 9464-9464/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-03 01:55:48.985 9464-9464/? E/android.os.Debug: failed to load memtrack module: -2
04-03 01:55:50.474 9476-9476/? E/cutils-trace: Error opening trace file: Permission denied (13)
04-03 01:55:52.150 9508-9508/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-03 01:55:52.151 9508-9508/? E/android.os.Debug: failed to load memtrack module: -2
04-03 01:55:52.324 9518-9518/? E/libprocessgroup: failed to make and chown /acct/uid_10058: Read-only file system
04-03 01:55:55.262 9518-9518/co.jp.sabtest E/Ads: Google Mobile Ads SDK initialization functionality unavailable for this session. Ad requests can be made at any time.
04-03 01:56:05.983 1157-9339/? E/AudioMixer: AudioMixer::getTrackName out of available tracks
04-03 01:56:05.983 1157-9339/? E/AudioFlinger: no more track names available
04-03 01:56:05.983 1157-9339/? E/AudioFlinger: createTrack_l() initCheck failed -12; no control block?
04-03 01:56:05.984 1525-1995/system_process E/AudioTrack: AudioFlinger could not create track, status: -12
04-03 01:56:05.985 1525-1995/system_process E/SoundPool: Error creating AudioTrack
04-03 01:56:07.287 1157-1999/? E/AudioMixer: AudioMixer::getTrackName out of available tracks
04-03 01:56:07.287 1157-1999/? E/AudioFlinger: no more track names available
04-03 01:56:07.287 1157-1999/? E/AudioFlinger: createTrack_l() initCheck failed -12; no control block?
04-03 01:56:07.288 1525-1995/system_process E/AudioTrack: AudioFlinger could not create track, status: -12
04-03 01:56:07.289 1157-8971/? E/AudioMixer: AudioMixer::getTrackName out of available tracks
04-03 01:56:07.289 1157-8971/? E/AudioFlinger: no more track names available
04-03 01:56:07.289 1157-8971/? E/AudioFlinger: createTrack_l() initCheck failed -12; no control block?
04-03 01:56:07.289 9518-9518/co.jp.sabtest E/AudioTrack: AudioFlinger could not create track, status: -12
04-03 01:56:07.293 1525-1995/system_process E/SoundPool: Error creating AudioTrack
04-03 01:56:07.296 9518-9518/co.jp.sabtest E/SoundPool: Error creating AudioTrack
04-03 01:56:09.292 1157-9339/? E/AudioMixer: AudioMixer::getTrackName out of available tracks
04-03 01:56:09.292 1157-9339/? E/AudioFlinger: no more track names available
04-03 01:56:09.292 1157-9339/? E/AudioFlinger: createTrack_l() initCheck failed -12; no control block?
04-03 01:56:09.292 1157-9303/? E/AudioMixer: AudioMixer::getTrackName out of available tracks
04-03 01:56:09.292 1157-9303/? E/AudioFlinger: no more track names available
04-03 01:56:09.293 1157-9303/? E/AudioFlinger: createTrack_l() initCheck failed -12; no control block?
04-03 01:56:09.293 9518-9518/co.jp.sabtest E/AudioTrack: AudioFlinger could not create track, status: -12
04-03 01:56:09.293 9518-9518/co.jp.sabtest E/SoundPool: Error creating AudioTrack
04-03 01:56:09.300 1525-1995/system_process E/AudioTrack: AudioFlinger could not create track, status: -12
04-03 01:56:09.308 1525-1995/system_process E/SoundPool: Error creating AudioTrack
04-03 01:56:11.602 1157-6597/? E/AudioMixer: AudioMixer::getTrackName out of available tracks
04-03 01:56:11.603 1157-6597/? E/AudioFlinger: no more track names available
04-03 01:56:11.604 1157-6597/? E/AudioFlinger: createTrack_l() initCheck failed -12; no control block?
04-03 01:56:11.608 9518-9518/co.jp.sabtest E/AudioTrack: AudioFlinger could not create track, status: -12
04-03 01:56:11.609 9518-9518/co.jp.sabtest E/SoundPool: Error creating AudioTrack
04-03 01:56:11.613 1157-6254/? E/AudioMixer: AudioMixer::getTrackName out of available tracks
04-03 01:56:11.615 1157-6254/? E/AudioFlinger: no more track names available
04-03 01:56:11.615 1157-6254/? E/AudioFlinger: createTrack_l() initCheck failed -12; no control block?
04-03 01:56:11.620 1525-1995/system_process E/AudioTrack: AudioFlinger could not create track, status: -12
04-03 01:56:11.624 1525-1995/system_process E/SoundPool: Error creating AudioTrack

java
1        AudioAttributes audioAttributes = new AudioAttributes.Builder()
2                // USAGE_MEDIA
3                // USAGE_GAME
4                .setUsage(AudioAttributes.USAGE_GAME)
5                // CONTENT_TYPE_MUSIC
6                // CONTENT_TYPE_SPEECH, etc.
7                .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
8                .build();
9
10        soundPool = new SoundPool.Builder()
11                .setAudioAttributes(audioAttributes)
12                // ストリーム数に応じて
13                .setMaxStreams(2)
14                .build();
15
16        // one.wav をロードしておく
17        sound = soundPool.load(this, R.raw.sound, 1);
18
19
20        // load が終わったか確認する場合
21        soundPool.setOnLoadCompleteListener(new SoundPool.OnLoadCompleteListener() {
22            @Override
23            public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
24                Log.d("debug","sampleId="+sampleId);
25                Log.d("debug","status="+status);
26            }
27        });