Hi there.
I use arduino uno with GRBL + cncshield to control my cnc / laser machine. I have a rather big problem with the machine stopping at different places in a job.
there are some who say they are quite sensitive to voltage spikes, and you may can put a voltage protection over. But do you do it on the 230 v side or on the 12 v side?
Or can - is it something completely different that is wrong?
Information required
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project 
See About the Installation & Troubleshooting category.
sorry for posted wrong 
But thanks for you moved it 
See post 2. You are asking what the problem is but have given virtually no information,
Eg what is wrong with my car?
Think about the information one might need to know before giving a useful answer!
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