Video resolution drops in While cycle

[UANEMESIS]

Greetings everyone!

Can't understand why after 2nd video recording I'm getting video with low resolution (looks like drop of settings).
Code:

from picamera2 import Picamera2
from picamera2.encoders import H264Encoder, Quality
import time
from functions import get_time_for_media
 
picam2 = Picamera2()
picam2.options["quality"] = 95
picam2.configure(picam2.create_video_configuration(main={"size": (1920, 1080)}))
encoder = H264Encoder(bitrate=800000)
picam2.start()
time.sleep(1)
 
media_count = 0
 
def rec_video():
    picam2.start_recording(encoder, f"/home/test/Desktop/my/mymedia/vid_{media_count}_{get_time_for_media()}.h264", quality=Quality.HIGH)
    time.sleep(10)
    picam2.stop_recording()
    print(f"Media count: {media_count}")
 
def capture_photo():
    picam2.start_and_capture_file(f"/home/test/Desktop/my/mymedia/img_{media_count}_{get_time_for_media()}.jpg")
    print(f"Media count: {media_count}")
    
while True:
    rec_video()
    media_count +=1
    capture_photo()
    time.sleep(1)
    rec_video()
    media_count +=1
    capture_photo()
    time.sleep(1)
    rec_video()
    media_count +=1
    capture_photo()
    time.sleep(1)
    rec_video()
    media_count +=1
    capture_photo()
    time.sleep(1)
    break

[UANEMESIS]

UPDATE:
I fixed it by updating video function:

def rec_video():
    picam2.configure(picam2.create_video_configuration(main={"size": (1920, 1080)}))
    encoder = H264Encoder(bitrate=800000)
    picam2.start_recording(encoder, f"/home/test/Desktop/my/mymedia/vid_{media_count}_{get_time_for_media()}.h264", quality=Quality.HIGH)
    time.sleep(10)
    picam2.stop_recording()
    print(f"Media count: {media_count}")

but still can't understand why configuration should be always call again, on each iteration of video capture!?