Thankyou everyone whos read this thread, i really appreaciate your consideration of helping
1. Not everyone who reads can or is willing to help (and has no obligation to do so);
2. People who can and want to help may run out of ideas at some point.
But I understand your frustration, specially if you are "exhausted mentally".
You said that
you didn't touch your drivers, but has Windows Update or any other of those "wonderful" drive updating tools done it?
And I couldn't understand from your posts, but does the problem occur with any USB sticks that you connect to that computer, or just with these two sticks?
Do you have any other USB hardware that puts stress on the USB transfer (e.g. HD-quality webcam), that you can connect to see if the problem is just with mass storage devices, or with any kind of USB devices?
Can you boot some Linux distro on these computers, transfer big amounts of data to and from the USB sticks, and see if problematic behavior occurs on Linux too?
Not at all and ofcourse, but many people who read this thread considered on helping.
I'll try an external hdd for "stress", i dont have anything else.
The usb drives work flawlessly and at fullspeed on all computers AND devices, the usb drives themselves are fine, HDTune reported no issues, my computer and one other are having the same usb issue with any usb flash drive, even ones prooven to function flawlessly.
Windows update is set to manual, and i dont use any driver updating bloatware.