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TPA3110D2PWR使用问题

Other Parts Discussed in Thread: TPA3110D2

TPA3110D2PWR 使用在将/SD管脚和/FAULT管脚短接在一起并且上拉到vcc,但是有时候出现音频无输出,重新断电才工作正常的现象,另外音频主观听上去有些失真,特别是在高音的时候。

      另外板子有嘶嘶噪声,手接触板子噪音就几乎没有了,请问这种噪声是属于什么噪声  怎么好滤掉 ?  将电源地通过电容接外壳地?