Samsung Galaxy Note 4 N910C USB connection interrupted repeatedly

Recently I flashed the lollipop firmware and didn't like it so, I flashed 4.4.4 again for my N910C and rooted.

I can't use USB connection normally now. When I plug my phone to my laptop, I can see and edit folders of my phone for 10 seconds, then the connection interrupts and re-connects. This process repeats and doesn't stop.

I already tried *#7284# and *#0808# processes but they fail all the time.

How can I solve this issue?

Thanks.