Thank you, but for luck I solved the problem. The solution was easy: first deconnecting everything, router reset, then connecting the devices after each other. Now everything's fine with 4 usb...

Until now I used an ARCHER AC1200 router and the USB storage sharing worked well with acitve USB HUB. Then I bought a brand new AX55 with USB 3.0 slot, and if I connect more devices (2 HDDs) to the...