IVS - live streaming issue - Starvation start

Yesterday I streamed a live event to IVS. most of the event was live, but between the live parts, we streamed pre-recorded video clips. Each time we played a pre-recorded video Amazon ivs console alert that we have "Starvation start", when we switched back to the live part we got "Starvation end" during the pre-recorded clips the audience complained that the video buffered and paused a lot. In the live parts, everything was good. can someone please help me understand why this happened each time I streamed pre-recorded video? thanks for all the help!