altair60 When the ASIAIR PLUS is started without the cameras plugged in the device boots up regularly and after the cameras are plugged in everything works as it is supposed to
I am curious, how are your cameras and the ASIAIR powered? Are the cameras powered directly from a power supply, or are they powered through the ASIAIR's power outlets? Are you powering the ASIAIR with at least 18 AWG wires, and what is the length of the power cable to ASIAIR?
I have noticed that there is a change with the recent ASIAIR firmware. In the past, the ASIAIR only turns the fan of a camera on at boot up time. The recent firmware versions appear to also turn the Peltier cooler on. It is possible that the extra current draw is causing what you observed.
I have not yet encounter a problem with a pre-connected camera (ASI2600MM), but my camera's 12V is sourced directly from a (25A, set to 13.8 volts) power supply, and not through the ASIAIR's power outlets.
The ASIAIR (dunno about the third generation, but with the two previous generations) itself pulls close to the maximum power during boot up. Any additional load on the USB ports could be just enough to drop the voltage to cause problems.