Real-time issue after perform bulk insert into MongoDB

Hi everyone, I am using Meteor as backend along with Angular in frontend for a real-time dashboard that analyzes messages for an Omni-channel
The current issue I’m facing is that when I perform some heavy insertions (hundreds of records one by one into the MongoDB by extracting data from an excel file), the minimongo on client is no longer synchronized with MongoDB in the backend, which makes the real-time update disappear. However, after quite along time (about few hours later), everything just works as normal again. I have no idea why this happened. Have you every encountered the same issue ? How to solve it ? I will be appreciate for all your helps. Thanks in advance