Trimble s5 locking on random shiny things in active mode

Previously there was a glitch where the prism mode of the mt1000 would switch to passive everytime you used "check backsight". That bug was fixed and hadn't had that particular issue in a long time. 

Today in active mode with the prism turned on the robot kept getting locked on a shiny bit of tape at the bottom of a window. 

Anyone else experience this recently? I haven't gotten any update in months, so not sure why it would change.