Try and see what happens without a throttle plugged in. I can, (if I can be arsed enough) test it, but my X52 is something like 15 years old. The electrical internals might be very different to yours.
Back in May 2015 I bought a Thrustmaster Warthog HOTAS. Serial number in the 33000 range. It's had relatively little use. Recently the throttle has started to feel a little bit grindy at the top 80% ...
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