What should I do if the programmer's programming chip is unstable?

Now more people pay attention to the online programming that integrates programming and testing. In order to improve the efficiency of programming, some fixtures and programming tools are usually made. Long wiring is required between fixture, tooling and programmer, and the length of wiring will affect the signal transmission strength. Generally speaking, the longer the wiring, the weaker the signal. When the signal is weak, the defective programming rate also increases. So how to solve the problem of instability in the programming process of the programmer?