Why don't the ISS cameras ever experience technical problems at night? I never have seen the banner flash on the screen stating they are experiencing technical difficulties or switching cameras. Also, how cheap are these cameras and why would you waste potential expensive time replacing this type camera and not use high quality? It would be the first time I heard of a US government agency trying to be frugal.
The technical difficulties NASA refers to are those regarding communications (LOS) with the space station's feed and/or cameras switching. The ISS tracking stations lose contact with the space station during certain times of the orbit.
Also, don't compare consumer-level electronics with those used in aerospace. Lots of factors such as temperature resistance, radiation hardening, camera interface, power requirements, etc. go into choosing or designing a camera to go on the ISS.