Marc
The older ( before 2018 ) ZWOASI120MM USB2 cameras have an inherent problem with the driver and ZWO advised that a patch was being developed to resolve intermittent connection failures ( don’t know if they ever resolved it )
I used mine as a guide camera for 3 months back in 2018 but gave up due to frustration. Went and bought the ZWOASI120MM - S USB3 camera from advice and it’s been working flawlessly ever since connected either with a 5m USB2 cable or a super duper expensive Startech 5m USB3 active cable
At the time, I did see a post on CN which raised the same issue with this model camera
Hope the above helps
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