Suddenly my brother's printer stops printing without wire. It is printed perfectly by a USB cable. How can I print over wifi?

The software or work you are doing on your PC is not capable to handle your card. It is my personal opinion. Might possible your card is old and not enough to work with the latest updates on your software or games whatever you are using. It is also possible that at some point may crash your display because all other time it is working. It should not work any time if there is a card or PC issue. One thing you cantry simply format your PC and try to check the problem still presists.

Once my printer also started skipping lines. It was not fixed but it skipped 2 or 3 lines. Sometimes it prints fine but sometimes it skips the lines. Even text got also prints in two lines of the same lines. One of my friends suggests changing the link as well as a cartridge but nothing helps. Even I did Align the printer but the printer was aligned even doesn’t print in a line. Finally, I change the paper as told at fix printer skipping lines and it starts printing line by line. Print quality also gets much better. It looks a bit awkward but it’s true changing of paper can fix lots of print issue and increase the life of printer as well.

I had the same issue many times. I did the alignment, use high-quality print but nothing works. In the last, I applied a solution from Why is my Epson printer skipping lines when printing and it got fixed. I just changed my printing paper. The paper I was using was not capable to move with this model of Epson printer. The Paper was very thin and slips between the rollers and it skipped the text.