I’m not seeing the strobing since I installed the 11.2 update. If you are getting it reappear intermittently I can think of a few potential causes. Whatever, it appears there is a brief scan when the camera is first activated, then it probably checks again at intervals (I guess 5 seconds).
The light source where you noticed the 5 second cycle might not have a fully stable frequency. This might be more likely if it has electronic control (LED and similar sources) rather than fluorescent which is driven directly at the frequency of the public supply. A fluorescent with electronic dimming would also be a contender for this.
Another possibility particularly with LED lighting is a source which operates with high frequencies (much more than the usual 50/60Hz mains) and it is at the limits of the auto adjust capability.
A mixes light source like fluorescent + LED on different frequencies could also provide a confusing signal for detection.
The quick and dirty test is to try with a similar but different light source, and see if the problem has a different appearance.