Is the problem something you can test? If you put the hall switch in one position, will the garage switch always work (or not work). Try the other position with the hall switch. If the problem is repeatable, then I'd be inclined to think that someone used an ordinary switch when they should have used a three-way switch. One way to tell, without opening the box, is that three-way switches are NOT labeled "on" or "off".

If you can repeat the problem, it might just be a bad switch or something off in the wiring. "Back stabbing" devices can cause weird problems too.

Sounds like a 3-way switch setup. If connected improperly at one or both switches, the light will be ON only when the switches are in a particular position.

Thanks for your replies! The switches both are not labeled. I'm guessing it has to do with how one is wired. But, it's not something that can be repeated. It's very random and will be months between happening.

"The switches both are not labeled."

Three way and four way switches are not normally labeled with off-on positions since the operation of each depends on the position of the other(s).

You may have the more commonly used of the two switches simply starting to wear out.