The modern CMOS cameras are coming with multi-megapixel sensors and all this information should be transferred to the computer. Everyone wants that transfer to be as fast as possible and if you have a model built in the last several years it is a USB3 camera. So far so good! However it happens that your camera could not play nicely with your computer. As a result you will see problem with the image downloading - usually the software is hanging waiting for image than never comes and the only solution is camera restart.
First of everything check if the USB power management is disabled! Here is short clip how to check / disable it - Clip in YouTube
Second, never operate the camera without AC adapter unless it has no powering port! Use power adapter that could feed the camera without being on the limit! If your camera needs 2 Amps, use 3-4 Amps adapter. Some adapters could perform significantly worse under cold conditions, so have good amount of amps in advance.
During the time several solutions have proven that give results in solving the problem of the USB3 instability problem:
Try to lower the USB Speed setting - this the speed of the communication between the camera and the computer. This could be made via the ASCOM driver Properties or via the CCD Settings, both available via Settings button in Camera Tab
If you are using USB Hub try to connect the camera directly to the computer in order to exclude the hub as source of the problem.
Try to connect the camera to other port of the USB Hub or computer.
If you have other cable or/and hub try them. Powered USB Hubs are always a better option! If you have round USB cable try it instead the flat cables that usually come with the cameras.
Check the computer BIOS and if there is setting for CPU power management disable it. If there is setting for USB power management disable it too.
In case you are reaching this point try to put powered USB 2.0 between the camera and the computer. This will solve general incompatibility between the camera and the computer.
If you are using active USB cable/repater make sure that it is from same or newer generation, compared to the USB hub generation.
In addition, make sure that there are no running USB speed booster applications (some laptops come with pre-installed application that could offer optimized transfer)
