U2722D, three, MST daisy chain issue

Hello,

My three display setup:

Precision 3561 notebook (with TB4 USB-C) -> WD19TBS dock (with 2 full size DP port)

I have three U2722D monitors (MST compatible). Two monitors (A and B) connected directly to the WD19TBS DP ports, and the 3rd monitor (C) chained from the 2nd (B) monitor DP out port. I used the attached DP cable of the monitors.

I not using the display of the Precision 3561, just the three U2722D monitors.

I using Windows 10 pro and the OS, drivers, firmwares is all updated.

My problem:

When I turn on (from hibernate or from shutdown state) or restart the Precision 3561, sometimes turned on all 3 displays as were setup (extended display), but sometimes turned on just 1 monitor (A), always which is connected directly from WD19TBS, and the B and C monitor is remains on standby. Absolutely randomly.

What could be the problem?