Callback methods of downloading data are not called

I am using two sensors simultaneously download data from sensors. I am using below callback to get downloaded data. But sometime this callback is not called. We are not able to detect the state when this is happening. There is no methods in documentation where we can find why this callback is not called. Please help me get rid of this issue.

mbl_mw_logger_subscribe(logger, bridge(obj: self), { (context, data) in
let this: PerformanceViewController = bridge(ptr: context!)
if let datax = data?.pointee{
let obj: MblMwCorrectedCartesianFloat = datax.valueAs()


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