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After not using the tuner for several weeks, I bought a new mouthpiece and decided to check a few pitches. After turning it on, multiple "needles" showed on the screen, both on the flat and sharp side. I replaced the battery. Same thing. My wife asked if it has a reset button. No, it doesn't. Do I need to buy a new one?

Yes, you probably do need a new one. One of my Korgs started acting wacky a couple of years ago. I took it all apart and traced the problem to one of the little rubber pushbuttons. I got it working for a few days, but it didn't last. The things are so cheap now that it just isn't worth the time to repair it.