I can't transfer iPhone videos

I can Sometimes connect my iphone12pro max to my window 10 pro laptop with a USB cable & sometimes I can't. when I see apple icon, I can copy some photos to my laptop as normal then stop suddenly, but if I try to copy a video, it starts to copy, and then a message comes up that says my device stopped functioning. My phone storage is full and I can't do it via iCloud or google drive, It's my first time with an iPhone and I'm really annoyed with my first iPhone experience, someone can help?