Facing the same issue. My status was changed to Final Review on 9th Feb and now its fluctuating from Complete to Final Review and status date is changed again to 5th MarchMy Timeline :
Application sent : 21st September, 2018
Application received : 27th November,2018.
AOR 1 & AOR 2 received on 27th Nov, 2018.
Status on portal : In line for Processing
Status changed to : Assessing on 8th Feb,2019.
Status changed to : Final Review on 11th February, 2019.
My status now keeps fluctuating from Final Review to Complete .
When do you’ll think I can expect my ECA ??