TTUSB Turntable plays slower than usual

I've always played my records at the same pitch and recently noticed that they are playing a bit slower than usual. I'm not sure what could be the cause. I also looked into typical signs of belt wear like wow and flutter, but my records don't speed up and slow down when played. About a month ago I started using a record brush and try not to apply more than the weight of the brush to clean, but could this be the cause? Records just play slightly slower than usual.
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