From Griots,
In regards to your question, we have never had a bad batch of our Random Orbitals. Our orbitals are not industrial strength machines and cannot handle 10-12 hours of continuous use. Many detailers use our machines in this way (all day, everyday) and then say our orbitals are defective or do not work after a year or two of use. The orbitals are designed for a hobbyist or the weekend car guy who has a few vehicles to regularly polish and wax, it's not designed for professional use.
**And yet allot of pro's use it regularly, have no complaints and have had good customer service from Groits
Our lifetime warranty covers manufacturer defect, we do not warranty wear and tear. So if the orbital unexpectedly stops working and was purchased directly from us, we will repair or replace the machine. If the orbital stops working due to being dropped, abused, run-over, etc. we will not warranty it.
If the orbital or any products of ours are purchased through an outside vendor such as Auto Geek, all returns and warranty claims must go through them, we cannot accept orbital returns without having a record of the purchase in our system.