Ha! Back in the day I had to exchange my Gameshark 64 four damn times. Ended up getting an off-brand device called the Xplorer/Xploder (one of those, depended on whether you were NTSC or PAL) 64 that worked a lot better.

Ah, the wonders of throwing Zelda: Majora's Mask into debug mode and L-Button Moon Jumping everywhere while dressed as Fierce Deity Link outside boss rooms.