TOUCH8 gives very different values after some time

[koromkorom]

Hardware:

Board: ESP32 Dev Module
IDE name: Platform.io
Flash Frequency: 40Mhz
PSRAM enabled: no
Upload Speed: 115200?
Computer OS: Ubuntu

Description:

After some time reading touch sensors, TOUCH8 gives very different values.
Some bias just comes up out of nowhere.
This only happens for TOUCH8.
See output below.

Sketch:

#include <Arduino.h>

uint16_t sens;
int touch_inputs [10] = {T0, T1, T2, T3, T4, T5, T6, T7, T8, T9};

void setup()
{
    Serial.begin(115200);
    for(int i=0;i<10;i++){
        sens = touchRead(T8);
        Serial.print(String(sens) + " ");
        delay(1000);
    }
    Serial.println();

}

void loop()
{   
    for(int i=0;i<10;i++){
        sens = touchRead(T8);
        Serial.print(String(sens) + " ");
        delay(1000);
    }
    Serial.println();
    for (int i = 0; i<10; i++){
        sens = touchRead(touch_inputs[i]);
        Serial.print(String(sens)+ " ");
        delay(1000);
    }
    Serial.println();
    delay(1000);
}

Serial Output. I marked all TOUCH8 outputs as bold.

53 61 60 60 60 60 60 60 60 60
61 61 61 61 61 61 61 61 61 61
79 49 73 79 87 85 89 95 60 102
105 105 105 105 105 106 106 106 105 105
80 49 74 79 88 86 89 95 104 102
104 104 105 104 104 105 105 105 105 105
80 49 74 80 88 86 89 95 105 102
105 104 104 104 104 104 104 104 105 105

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