Hi Earle, we are sorry to hear you of this issue you are having with your D510.
DISTOs are generally not repairable. If your D510 is under warranty (max 3 years from date of purchase), we will replace it.
If you are out of warranty, we have a program that enables you to purchase a replacement at a discount.
To get started, please visit our support site, MyWorld.
If you have registered with MyWorld, log in and navigate to your device list to get support, otherwise click the “Get Support” link below the login to start a case.