The issue could be something as simple as a wheel speed sensor not registering. The computer should have a code stored to tell you what the issue is. The reason it works fine when you first start the engine is the ABS and Traction system do a self check each time the engine is started. As long as everything passes it gives the green light and the system is active. When the system detects an error after you start moving it gets disabled and this effects other systems. You need to find and repair the error and all should be good.
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