Iiyama monitor disconnects frequently over USB-C in Windows 10

I have been using Dell XPS 13 9370 with Lenovo 4K monitor connected with USB-C cable only (USB-hub for mouse + keyboard, power delivery 60 W) and it was working smoothly. Recently I bought a new monitor for another working location. It is 27 iiyama ProLite XUB2792QSN-B5. I used the same setup but suddenly the monitor is disconnecting from laptop randomly. This monitor has 65 W PD and a lower resolution. I even decreased the frequency to minimum, exchanged the cable to 40 Gbps but nothing helps. Unfortunately, I cannot return this monitor. I use only one monitor, the laptop lid is closed. Vendo

Question by Leos Literak on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.