We are sorry to hear that you are experiencing issues with your DVCL-153P in a 3-way application. Please be sure that we are only using one DVCL-153P in a 3-way application and the second location is a mechanical switch. Click on the following link for the installation guide: https://assets.lutron.com/a/documents/0301882.pdf. If you are looking for dimming in both locations, we would recommend using the Maestro dimmer MACL-153M along with its companion dimmer MA-R. Here is an install guide for the Maestro series: https://assets.lutron.com/a/documents/replacing_a_dimmer_with_a_dimmer.pdf
If you still have further questions or concerns, you can contact our Support Team at support@lutron.com or call 1-844-LUTRON1.