Cant copy big files via USB

hey guys, i have a pretty big problem with my OnePlus3.
whenever i copy a lot of files (like mp3s) or very big files (movies) via usb from phone to pc or from pc to phone i basically always get an error somewhen during the copy process.
if it are a lot of small files most of them get copied and i just have to try the missing ones again. but bigger files are nearly impossible to copy due to this stupid error.
the error occurs on differnt points of the copy progress bar so its not always the same. i guess if i would try it 100 times i might have luck somewhen and be able to copy a big file.

i really dont know what to do about this...

i am running Freedom OS 1.7 (Android M), but already had this problem on privious versions and stock (OxygenOS). so its nor ROM related i guess. also i havent found any similar problem in OP3 section. no idea whats wrong :/
pc is win10, usb driver installed ofc.

if you need to know something else just ask.
please help me obi wan...eeh, xda. you are my last hope.

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