@Guto-Du it's a possibility it's defective. Try over volting the pi (without over clocking) to see if it's more stable. If it is then your pi isn't stable at factory settings and should be sent back for replacement. I have seen multiple reports of pi zero's not stable at factory clock speeds. I think the quality control on the pi zero might be slightly less than other models. Probably because it's a $5 computer.
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