I use driver like this

import ...
chrome_options = Options()
chrome_options.add_experimental_option("debuggerAddress", "127.0.0.1:9222")
driver = webdriver.Chrome(options=chrome_options)
# then I open target URL in chrome manually
input_element = driver.find_element(By.XPATH, '//textarea')

sometimes it works, but sometimes I can not locate the target element.
Then I try it in debug, after breakpoint, I can see that there is a textarea tag in driver.page_source, but

driver.find_element(By.XPATH, '//textarea') 

still doesn`t work, even

driver.find_element(By.XPATH, '/html') 

will return no such element.

I try driver.refresh(), it works.
I don`t know what happen to the driver