input loses focus when typing

Hello, I'm losing focus when typing any letter in my input

Component and your call

const RenderInput = this.renderInput;
 <Field
      name="email"
      //component={this.renderInput}
      component={(props) => <this.renderInput {...props} onChangeTextDestino={this.onChangeTextDestino.bind(this)} />}
      type="email"
      validate={[email, required]}
 />



renderInput({input, label, type, meta: { touched, error, warning } ,onChangeTextDestino}) {
    return (
      <View>
        <Item error={error && touched} rounded style={styles.inputGrp}>
          <Icon
            active
            name={input.name === "email" ? "mail" : "unlock"}
            style={{ color: "#fff" }}
          />
          <Input
            ref={c => (this.textInput = c)}
            placeholderTextColor="#FFF"
            style={styles.input}
            placeholder={input.name === "email" ? "Email" : "Senha"}
            secureTextEntry={input.name === "password" ? true : false}   
            onChangeText={text => onChangeTextDestino(input.name,text)}
            {...input}
          />
          {touched && error
            ? <Icon
              active
              style={styles.formErrorIcon}
              onPress={() => this.textInput._root.clear()}
              name="close"
            />
            : <Text />}
        </Item>
        {touched && error
          ? <Text style={styles.formErrorText1}>
            {error}
          </Text>
          : <Text style={styles.formErrorText2}>error here</Text>}
      </View>
    );
  }

constructor and function:

constructor(props){
    super(props);
    this.state = {
      strEmail: '',
      strSenha: ''
    };
    this.onChangeTextDestino = this.onChangeTextDestino.bind(this)
  }
  textInput: Any;

  onChangeTextDestino(param, value) {
      try {
        if (param === "email") {
          this.setState({
            strEmail: value
          })
        } else {
          this.setState({
            strSenha: value
          })
        }    
    } catch (e) {
      console.log("error", e)
    }
  }

What should I do to stay focused?