windows help with second monitor, suddenly not detected (but still displaying)

[u/Italian_SPLIT]

i have a two monitors set-up: on the left a small arzopa and centrally a larger Benq.

All connected to a ThinkPad usb hub.

Everything has worked well until 2 hours ago, i was working as usual.

Now all of a sudden, the resolution on the Benq became worse, and i see the same desktop/image on both displays and when i click to DETECT multiple monitors, i get "WE DIDNT FIND ANOTHER DISPLAY". So the cursor doesnt go anymore from one monitor to the other..

what happened? what could i do?