Try and exercise the control sticks a lot while off. Some old RC plane guy told me the transmitter control pots get noise in them much like a radio dial's volume control if he doesn't exercise them over their range of movement. I notice it seems true on a couple of my radios where the volume gets scratchy and noisy, and if I crank the knobs back-and-forth a lot it helps. Don't know if its oxidation or what that causes it.
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