Since it's a recent (this year) purchase, it's probably a model 3930, if it is a Roku Express. That's the current model device with that name, and it would be expected to work.
Since you have several devices, you have some troubleshooting options.
First, try a Factory Reset. With power applied, press and hold the Reset button for no less than 30 seconds.
If that doesn't work, it may be that there is something interfering with the network at that specific location (the TV you're trying). The Express is 2.4 GHz only, and depending on the channel it's on (for 2.4 GHz band, channels 1, 6, and 11 are the preferred ones). Moving the device to another TV may get a better signal and allow the update to work. That doesn't resolve potential network issues going forward, and isn't ideal, but this would be a proper troubleshooting step to determine if it's that specific location getting interference.
Some others here are network wizards, and may have some very good suggestions.
Apart from that, you can initiate a warranty return/replacement. https://support.roku.com/article/208757058
Roku Community Streaming Expert
Note: I am not a Roku employee.
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