Joint Issues on cobots

It happened to see that there are joint issues after the cobots are in operations for few years. Is there any possibility to predict that the joint have defect and it could cause down time in future in terms of temperature, current or voltage?

I am collecting these data by RTDE( PORT- 30001) and I would like to know if there is a range for [ temperature, voltage, current ]. or spike can be considered if its reaching more than a limit.

Thanks for any support.