Phone settings gets crash sometimes(Android version: 6.0.1)

I need to automate phone settings and google contacts in my test cases and I’ve used it as required. Everything works fine except some of the times(say 5 out of 50), my test case gets failed while automating these above mentioned applications(sometimes on phone settings and sometimes on google contacts).
And the error is:

java.lang.AssertionError: An unknown server-side error occurred while processing the command. (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 88 milliseconds
Build info: version: '2.53.0', revision: '35ae25b', time: '2016-03-15 16:57:40'
System info: host: 'Jitender-QA', ip: '187.287.116.82', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_20'
Driver info: io.appium.java_client.android.AndroidDriver
Capabilities [{appPackage=com.google.android.contacts, networkConnectionEnabled=true, warnings={}, databaseEnabled=false, deviceName=07ce7ce700f1d0e1, platform=LINUX, appActivity=com.android.contacts.activities.PeopleActivity, desired={appPackage=com.google.android.contacts, appActivity=com.android.contacts.activities.PeopleActivity, platformVersion=6.0.1, browserName=, unicodeKeyboard=true, udid=87hjtrgw23n709hn, platformName=Android, deviceName=87hjtrgw23n709hn, resetKeyboard=true}, platformVersion=6.0.1, webStorageEnabled=false, locationContextEnabled=false, browserName=, takesScreenshot=true, javascriptEnabled=true, unicodeKeyboard=true, udid=07ce7ce700f1d0e1, platformName=Android, resetKeyboard=true}]
Session ID: 1706f37f-6149-486f-8705-a8f687c573db

How could i get away with this issue?
Any help!