cross wires

Etymology 1
From the way two electrical wires that cross can create a short circuit.

Verb

 * 1) To cause difficulty; to interact in a way that generates conflict.

Etymology 2
Possibly a back formation from get one's wires crossed.

Verb

 * 1) To interact in a way that causes confusion or interference.

Etymology 3
From the use of fine wires placed perpendicular to each other in the optical pieces of telescopes.