Q: Does it mean that my revised manuscript has been assigned to a completely new reviewer and will go the review process again from the start if the status changes from “required reviews completed” to under review again?

Hi, We have submitted our manuscript to an Elsevier journal and it came back with major revision. After major revision we have submitted the manuscript back and it went to with editor to under review after one day and to required reviews completed after 2 weeks and then again to under review after 1 day. What does that mean? Does it mean the manuscript has been assigned to a new reviewer and will be assessed by him as a new submission and can take longer than expected ?