After we have upgraded various sparks (hardware: 1.7.15) to FW version 3.99.1911 we suffering with flickering images between the HDMI input (HD) signal and the default blue background the spark is giving when no signal is found. The NDI signal does not have any interruptions and the sound (jack) does not have any problems at all.

Does somebody has similar experiences and does have a solution in place? A reboot of the spark does help for minutes, but the problem is occurring more and more after more time has expired.