ADT/Smartthings Motion Sensor "LOSS OF SUPERVISION"

With Classic App shutdown how can I re-pair an ADT/ST Motion sensor ?. Panel warned “Loss of Supervision”, rest of devices are working 100%, 6 months ago happened same issue with same device in that time I reset device and re-paired it with Classic App (after 2-3 attemps), couple of week later did the same and had crazy behavior, I found it was because low battery level, replacing the battery got the device working great. Now device reported “Loss of Supervision” again, its not working warning about “By passed” to arm the alarm. How do it with no more Classic App, just New App ??.. Any ideas before I try it and mess it all ?..Thanks in Advance.