/diy/ - Do It Yourself

So esp32 has capacitance sensing pins, so i taped a wire to a piece of tin foil and connected it to one of the touch enabled pins.
And it worked! great. it could sense a body part at around 4 cm distance. perfect.
But the problem is that after couple of hours of running it always starts giving out high readings as if a touch is dectected. even if nothing is near the tin foil or the wire
Any idea how to reliably eliminate this problem while retaining at least 4cm sensitivity?