I've a circuit schematic:


I power my circuit using only PWR+ and PWR- at 24V.
When my power supply powers only one circuit or two, in parallel mode, I don't have any problem.
When I attach more like 3 circuits, sometimes at power ON all this circuits doesn't goes on.
I've measured voltage on PWR+ and PWR- when they stucks and all of them have 4.8V between PWR+ and PWR-. I've removed FUSE, D3 and V4 but nothing. Also reduced 100uF to 2.2uF and nothing.
I've supposed that if the voltage is too slow to rise on this device, it may stuck at certain point with a voltage at 4.8V (and output at 2v).
How I can solve or made immune this device to this behavior?
Also I can't understand how this device reduce my Vin from 24v to 4.8v, since I've 24V on my power supply instrumentation.