Freezing issue due to internet fluctuation and high memory usage

We have observed that whenever there is internet fluctuation or disruption, the courses freezes after 1 or 2 screens. Is there a solution that doesn't freeze because of internet fluctuation/disconnection(is restored in 1-2 seconds)?
Also, we have observed that the memory usage shows more than 700MB and hence if there is any fluctuation in network then the courses freezes. Since there are no heavy images or videos, why does memory usage go so high?