My CNC gets stuck in random spots of the process

I have an arduino cnc shield, I installed GRBL without any problems though When I start a process it lock.
Thank you. has everyone who will answer.

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If it’s not the endstops, I don’t know what it is.

You need to try to pin down the G-code line that causes the problem.

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homing routine(cycle) is not done, so system in unknown position, any move triggers alarm mode.

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