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Always have multiple known good quality power supplies, and good cables (high current rated, and preferably short) , and try several of them first. Also know that power supplies which worked perfectly for year(s) can an do go bad -- they still look like they work in majority in cases, but at higher load their voltage drops below 4.75V even for a shor time, ...


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RPi is also sensitive to voltage at any time below 5V. In addition to quality - this is one reason the official supplies are also about 5.19V. Even RPi without USB peripherals but under heavy load can pull enough current to "brown out" (to the RPi) the voltage below 5.0 V. A spontaneous reboot is more a sign of voltage supply drops as the RPi will throttle ...


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Here's a quote from a reply that Logitech gave regarding the power consumption of their webcams: [On] C310, power consumption can be anything from 50mA idle to all 500mA for streaming video. It's quite typical for USB 2.0 devices to aim at always being under the 500mA power budget, which is a maximum that a fully compliant device can draw. So I think it'...


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No one is mentioning that the Maximum total USB peripheral current draw on a rpi 3b+ is 1.2A (power requirements) Having said that your current psu is enough. If the cameras are indeed drawing more than 600mA each (which I really find it hard to believe, unless they are dodgy) you should start exploring the option of a powered usb hub.


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In the absence of any quantitative observations, the community can only guess. What is the current rating for the power supply? Perhaps a power supply with more current can solve the problem if the cameras need more current than what is available. If only one attached camera does not cause a reset, then, the current (amperage) is in all likeliness the ...


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