There are only 2 things that will cause your printer to only print half pages:
1.) If you are connected to the printer wirelessly, then the signal could be dropping out mid-print. You may need to either move the printer a little closer to the router or, if it is too close, move it a little further away. You can test this by plugging the printer directly into the computer and printing a test page. If it prints with no problem, find a closer spot where there is no electrical interference and not too close to the router. If it is too close, do the same. Also make sure the printer is plugged directly into an outlet and not into a surge protector.
2.) If it isn't the connection, then it is a physical issue with the printer itself. This being a new printer, the only troubleshooting I would perform would be to unplug the printer from power for about 10 minutes and then plugging it back in and trying it again. This hard resets the printer and clears any static that may be in the printer as well.
If none of this works, I would definitely take advantage of your return policy at the store you purchased it from. With any electronics, there is usually a 15 day period where you can return or exchange with no issue. There is also a one year manufacturers warranty on ALL electronics.
I hope this helps you in your resolution for this.
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