Flutter decoding of large json sometimes gives errors while parsing

Im using dio to retrieve large json data from my Laravel backend, the problem is that, sometimes it works perfectly and it gets parsed correctly, and sometimes it returns:

FormatException: Unexpected character

Here is how im using dio:

class CartRepository {
  final dio = Dio(BaseOptions(
    baseUrl: API.apiURL,
    connectTimeout: 120 * 1000,
    receiveTimeout: 120 * 1000,
  ));

  Future<void> initializeToken() async {
    final token = await Storage.getToken();

    dio.options.headers['Content-Type'] = 'Application/json';
    dio.options.headers['Accept'] = 'Application/json';
    dio.options.headers['Authorization'] = token;
  }

  Future<Cart?> getCartProducts({required String storeUUID}) async {
    await initializeToken();

    try {
      final Response<String> response = await dio.get(API.apiURL + 'cart/$storeUUID');

      if (response.statusCode == 200) {
        final products = Cart.fromMap(jsonDecode(response.data!)); // <<<<<<<<

        return products;
      }
    } on DioError catch (exception) {
      if (exception.type == DioErrorType.response) {
        if (exception.response!.statusCode == 401) {
          throw UnauthorizedException();
        } else {
          throw ServerErrorException();
        }
      }

      log(exception.toString());
    }
  }
}

Here is an example of the error:

[log] DioError [DioErrorType.other]: FormatException: Unexpected
character (at character 30379)
…Dv0gII9i2AK.jpg","image_0_url:null,"image_1_url":"product_images/oKoNzu…

Notice that "image_0_url is missing the end quote.
The issue is that this same exact endpoint works well sometimes and doesnt work sometimes, and also, it never failed on postman, it always returns the correct json.

I have tested the returned json many times with online validated, also when i use postman to retrieve the exact same json data, it gets parsed correctly with never any issues.

PS: Please do comment on my implementation of the whole functionality if you notice a better way to do it