Hello  @skhu 

Thank you for the feedback,I did not see there is any motion detection adjustment on Tapo C210 V1 1.1.16 .

Can you help explain how did you find out the motion detection sensitivity dropped and share some video clips and photos showing the concern. 

1. Check if motion is detected by camera first:  try turning Alarm for cameras and see if Alarm goes off when a motion is detected? 
If motion does not trigger the Alarm,  try to Confirm Motion Detection is 'ON', and  set up proper Activity zone & Sensitivity settings as instruction here
How to use motion detection function of my Tapo camera in Tapo app

If the issue persists, can you help provide some information to help look into that further: 

1) the video clip showing the issue (use Tapo APP to manually the video and share video link here )

A photo of Playback timeline at that time. 

2) photo of motion detection settings, Activity Zone & Sensitivity 

3)  Does Alarm go off when motion is detected

If you use Motion detection/Continuous recording, please share photo of Recording Schedule,

4) Mac address of camera( please share MAC by  private message) / Tapo APP version