TTUSB with very low and distorted sound

TTUSB with very low and distorted sound

My new Numark TTUSB turntable worked fine for 1 month (I used it 5 times). But now, suddenly, when I'm trying to play it sounds very bad, very low and distorted.
I use the RCA line mode. I tried to adjust gain control but problem persists.
I recorded some tests via USB output, but has same problem.
I tried the 1/8" stereo input, and it sounds good.

Is a problem with cartridge/stylus?.

Something strange is that when the turntable is totally unplugged and I spin up the platter, the lights come on (power button, pitch and 33 rpm indicators).

Thank you for your help!.
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