IWDP crashes randomly on running iOS safari browser testcases

Appium 1.4.8
iOS version 8.1
IOS debug proxy latest
Safari Launcher latest 2.0

1.When i try running teestscript in safari browser in iOS device(iPad). I have appium up and running,ios_webkit_debug_proxy up and running.
2.My testcase starts executing first time correctly when my second testcase start it stalls and throws below error in IWDP

Unknown app_id PID:5728
Invalid message _rpc_applicationSentListing:
WIRApplicationIdentifierKey
PID:5728
WIRListingKey



ss.remove_fd(6)
Disconnected :27753 from LN iPad2 - v8 (2ad8553423bbc91a4a20cc5bda5115ecb6b000a5)
ss.remove_server_fd(4)

Is someone facing the same issue, i have a suit of 150+ cases to run on my safari browser. Kindly help!