Loose thread in standing lamp between base and rod
That's a common failure mode for those lamps; the threads are fairly shallow and prone to stripping out. Though if it happens immediately, rather than after a few years of use, I would definitely return it for refund and/or replacement.

If it fails after the warranty has expired:

It is possible to kluge the connection by wrapping the threat in teflon plumber's tape; enough layers will tighten the connection so the remaining threads can engage. This, too, tends to eventually fail, but you may get several more years of use out of the lamp.

Theoretically you could sweat-solder the mechanical connection, but you'd probably ruin the lamp's finish. Obviously you'd want to remove and reinstall the wiring so its insulation doesn't melt during thd attempt to solder it. And I'm not sure what solders would be compatible with the lamp's metal.

Realistically, most of us consider these lamps disposable. I just discarded one myself, after scavenging some parts that I'm planning to reuse.