pocoservice.apk出现crash 导致测试异常

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**描述问题bug**
(简洁清晰得概括一下遇到的问题是什么。或者是报错的traceback信息。)
pocoservice.apk出现crash 导致测试异常不再测试
```
（在这里粘贴traceback或其他报错信息）：
[pocoservice.apk] stdout: INSTRUMENTATION_RESULT: shortMsg=Process crashed.
INSTRUMENTATION_CODE: 0

[pocoservice.apk] stderr:
still waiting for uiautomation ready.
[pocoservice.apk] stdout:
com.netease.open.pocoservice.InstrumentedTestAsLauncher:INSTRUMENTATION_RESULT: shortMsg=Process crashed.
INSTRUMENTATION_CODE: 0

[pocoservice.apk] stderr:
still waiting for uiautomation ready.
[pocoservice.apk] stdout:
[pocoservice.apk] stderr:
[pocoservice.apk] stdout: INSTRUMENTATION_RESULT: shortMsg=Process crashed.
INSTRUMENTATION_CODE: 0
[pocoservice.apk] stdout: INSTRUMENTATION_RESULT: shortMsg=Process crashed.
INSTRUMENTATION_CODE: 0

[pocoservice.apk] stderr: [pocoservice.apk] stderr:

[pocoservice.apk] retrying instrumentation PocoService[pocoservice.apk] retrying instrumentation PocoService

**复现步骤**
1. 录制一个照相机的case，添加一个循环重复照相

**预期效果**
测试正常执行，照相正常。

**相关截图**

**python 版本:** `python2.7`

**poco 版本:**
`pocoui==1.0.70`

**设备:**
- 型号: [测试机]
- 系统: [Android 9.0]