SMP 3.0 online store returning data inconsistently

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Hi,

We have observed that smp online store returns data inconsistently to us. Returning us a proper collection most times but sometimes it gives us an empty collection with following error.

2016-12-15 15:28:46.247 com.sap.smp.odataonline ERROR Error occured during entity conversion: expected entity list type (parameter), found null* File:SODataConverter.m Function:-[SODataConverter entitySetFromString:entitySet:error:] Line:487 Thread:<NSThread: 0x165656c60>{number = 72, name = (null)}
2016-12-15 15:28:46.248 [530:290790] com.sap.smp.odataonline ERROR Error occured during response conversion: Error Domain=ParserDomain Code=2 "Error occured during entity conversion: expected entity list type (parameter), found null*" UserInfo={NSLocalizedDescription=Error occured during entity conversion: expected entity list type (parameter), found null*, NSUnderlyingError=0x1673e2fd0 {Error Domain=UnkownErrorDomain Code=-1 "expected entity list type (parameter), found null*" UserInfo={NSLocalizedDescription=expected entity list type (parameter), found null*}}} File:SODataRequestExecutionDefault.m Function:-[SODataRequestExecutionDefault payloadFromRequest:httpResponse:responseData:requestParam:resolvedResourcePath:error:] Line:785 Thread:<NSThread: 0x165656c60>{number = 72, name = (null)}
2016-12-15 15:28:46.248 [530:289118] Error while reading data from online store : Error occured during entity conversion: expected entity list type (parameter), found null*

We created a windows console app and polled the smp url consistently over 1000 times without any issues.

Issue only occurs while we make a call from ios app using smp online store.

Can anyone help us in resolving this?

Thanks in advance!