如代码所示，一段时间内多次调用 getBackgroundAudioManager，就会被强制 onstop （在两个安卓手机上都是调用 4 次以上，iOS 正常无误）。请问这是 bug 吗？如果不是请麻烦标注在文档上好嘛！！！！

function play() {
const backgroundAudioManager = wx.getBackgroundAudioManager()

backgroundAudioManager.onTimeUpdate(() => {
getBgam1()
getBgam2()
getBgam3()
getBgam4()
})

function getBgam1() {
return backgroundAudioManager.duration
}

function getBgam2() {
return backgroundAudioManager.duration
}

function getBgam3() {
return backgroundAudioManager.duration
}

function getBgam4() {
return backgroundAudioManager.duration
}

backgroundAudioManager.title = '此时此刻'
backgroundAudioManager.epname = '此时此刻'
backgroundAudioManager.singer = '许巍'
backgroundAudioManager.coverImgUrl = 'http://y.gtimg.cn/music/photo_new/T002R300x300M000003rsKF44GyaSk.jpg?max_age=2592000'
// 设置了 src 之后会自动播放
backgroundAudioManager.src = 'http://ws.stream.qqmusic.qq.com/M500001VfvsJ21xFqb.mp3?guid=ffffffff82def4af4b12b3cd9337d5e7&uin=346897220&vkey=6292F51E1E384E061FF02C31F716658E5C81F5594D561F2E88B854E81CAAB7806D5E4F103E55D33C16F3FAC506D1AB172DE8600B37E43FAD&fromtag=46'
}

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