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It sounds like there's a loose connection on the circuit. I would check all connections everywhere. If the wires are stuck in the little holes in the backs of the receptacles, remove them and wrap them around the screws on the sides. These backstabbed holes are the cause of lots of loose connections. Check junction boxs, under wire nuts and the connections at the breaker also.
PS: It is against code to have more than one circuit installed between your home and your detached garage. If more than a single 20 amp circuit is needed then a subpanel must be installed in the garage.
And no, you cannot use the neutral of another circuit, that is extremely dangerous. Like said, one circuit max to a garage unless a subpanel is installed.
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