[Problem] Cartridge or Display?

I bought a VIRTUAL BOY that came with the Mario Tennis, when i turn on the VB his right screen is apparently normal, but when i into the game it appears the initial screen of the game already appears a few bugs on the screen, like broken sprites and all, and when I put to play a game, the sprite of my character is all destroyed in the right display, and other things appear on the screen also broken.

I also noticed that depending on the time I turn on the virtual, sprites are less broken or more broken, do not know if I’m Reseating the cartridge.(I do not have another cartridge to test)

I never had a Virtual Boy before so do not know what problems happen to him.

If anyone can help me I would be very happy, because this Virtual cost a lot of money (I’m from Brazil, here these things are extremely expensive)

Right screen image (with bugs): http://i.imgur.com/RvZIKYT.jpg?1

Left screen image (normal screen): http://i.imgur.com/qdQDuFx.jpg

Thanks 😀