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Certainly nothing that the owner or consumer could do. Tesla's service department may have a way to do it if you call them, prove you're the owner, and explain the problem. This is also dependent on the car having a good cellular connection and the software is running well enough to respond to commands.
Reset or reboot?
Now that I've owned the car for a little bit, I can tell you the car only attempts to connect to your home's Wi-Fi for 2 reasons: When doing a software update, and if your Wi-Fi signal is stronger than the LTE one, which it rarely is in the garage. I don't think your car has an issue at all OP, but there's a very easy way to find out: Force it to connect manually, and if it connects, no problem. And even if it doesn't, it might not be the car's fault. Does it have enough signal strength? If you can't connect manually, move your router to the garage, and it absolutely should connect there. Only if it doesn't connect under those conditions, I'd suspect the car.
Finally, I turned off Wi-Fi, and the car turned it back on automatically yesterday, for a software update. I turned it back off today. As somebody said, there's no reason to connect to your Wi-Fi except for software updates. Hope this helps.
When I do a manual connect, the car complains that it can’t connect, because it can’t get an IP address from my server.
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So I do suspect there’s an issue with the software.