Video recording cuts out randomly after iOS 26 update on iPhone

i've tried multiple times, in multiple days, to record a video of me playing the piano but the video stops while im playing in random times(after 5s or after a minute).I thought it was the beta of ios 26 but i've updated to the ufficial version and i still have this problem

[Re-Titled by Moderator]

Original Title: videos interrupting themselves