Interesting. Whenever I see corruption, it specifically does not affect Dahua cams, and it is 100% pure rainbow corruption, unlike yours where some of the normal detail is still there. Anyway, hardware acceleration is typically involved. Which (if any) kind of hardware acceleration are you using? If it is Intel, know that there are 3 different Intel options, and currently in the latest 6 or so versions the best choice is "Intel + VPP".
I don't know enough about the internals of
Blue Iris to know how running in or out of service mode might affect it.