I'm in the same boat.
DS-2CD2132F-IS (original CCWR), wired connection, 5.3.3 is rock solid. Working for months, no network errors, processes power loss just excellent.
The camera writes video to the internal micro SD and photos to external ftp.
But 5.4.0, 5.4.5, 5.4.41 is a real problem.
The...