Linear WD500Z-1 (Go Control) Not dimming correctly

This is not a ST issue. I thought I would post this here to see if anyone else has had this issue. The Linear WD500Z-1 will dim up to 60-70% then resets to 0% and ramps up again. This is if you just press up. you can dim up and works to the 60-70% then resets to 0%. This is even before connecting it to ST Hub. The ST Hub will let me see the percentage and dial it in, with the slider on the app. But the dimmer switch behaves the same way whether it is connected to ST or not and this is the second one. I returned the first to Amazon which was free. I have used both incandescent and LED bulbs with same result. Is there a wiring issue I could look for?