Modern garage door openers do an automatic reset of the code every time that the door is opened. Somehow your or your neighbor's opener reset BOTH door opener codes the same.
Suggest that you remove the antenna from your opener and have your neighbor open and close his door a couple of times. That should reset his to a different code from yours. Then reinstall your antenna so that your opener will work.
Or you might simply shield your antenna with aluminum foil instead of removing it.
No guarantees from me, but it MIGHT work.
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