'hanging related issue in qt application over rpi after long time

we have developed QT application in QT5 over raspberry pi, in the application, there is multiple classes. Application runs very well while that classes's ui over screen for long time, but certain classes's ui scrren comes over screen application gets hang after 2/3/4 hrs(sometimes works very well here also). Our application uses full-duplex asynchronous serial communication in background, but that remains active even RPI gets hanged(we checked that over putty).

our set is - rpi3B model, rpi official 7 inch screen(via ribbion cable), microcontroller in background

qt


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