QServiceManager:: loadInterface API randomly returns NULL

QServiceManager:: loadInterface, sometimes, it returns NULL and console shows following messages.

[Qt Message] - response->isFinished: false

209.165 [Qt Message] finished ObjectEndPoint::waitForResponse

209.165 [Qt Message] response passed but not finished

209.165 [Qt Message] QObject::connect: Cannot connect RServiceSession::errorUnrecoverableIPCFault(QService::UnrecoverableIPCError) to (null)::errorUnrecoverableIPCFault(QService::UnrecoverableIPCError)

However, it does not happen always. Sometimes it gets the interface pointer.

I have attached the client app(helloworldclient) and service app(helloworldservice) with which I could reproduce the issue.
Steps to reproduce:

1)Run the helloworldservice and put it in backgroud.
2)Run the helloworldclient , select the first option to load the service.

The code where the loadinterface is called:

void View::openClicked() - view.cpp from helloworldclient.

Fell free to ask any queries.