@bm90001 I sill dont think the topic you link is initially about the same issue, because loosing network connection is not the same as the device not recognising the SIM. Overall we have now 3 topics about network issues when using dual SIM partially mixed with different problems. As the OP here has marked their issue as solved I will close here and move some posts to one of the other topics probably.
Edit:
Everyone having problems with mobile data connection when using dual SIM please head over to this topic