I don't know if this will help but I use a powered usb hub with my rpi4. Also I have to disconnect the camera before I start the rpi4, then connect it when the rpi4 is at the desktop. Other wise it will not connect to indi. Sometimes I can just unplug it and plug it back in to resolve communication issues. It may have to do with the camera powering up before the rpi4 because of the powered usb hub.

I was having the same issues with hanging but I don't know if it was a faulty camera or if I needed a powered usb hub. My first camera did die. The replacement had the same issues as the people above, but went away when I replaced the rpi4 with a new one.

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