背景音频偶尔会出现 playerErrCode:7, systemErrCode:2是什么原因？

{"errMsg":"playerErrCode:7, systemErrCode:2, domain:NSCocoaErrorDomain, description:未能完成操作。（“Cocoa”错误 2。）","errCode":10003,"src":"https://df.mayi-tao.com/program/myt/assets/video/no_voice.mp3"}

- 机型：iPhone 8 Plus (GSM+CDMA)<iPhone10,2>

正常播放背景音频：onError捕捉到错误-playerErrCoeL:7, systemErrCode:2,domain:NsCocoaErrorDomain....