Hi and welcome to the sometimes quirky world of the Planet Computers devices.
On low brightness settings, I have noticed, especially in a particular text editor, that my screen backlight brightness occasionally varies a little bit up and down, in step with the flashing of the cursor. In a wider context, that makes me believe that the exact level of brightness sometimes depends a bit on what, precisely, the Cosmo is doing at the moment.
To be clear, I wouldn't call phenomenon I sometimes observe flickering; it is more of a cyclic slight increase and decrease in backlight intensity, in pace with the cursor, and, for me, it only happens under certain circumstances.
If your screen is actually flickering, regardless of your brightness setting, what app(s) you are using, the battery charge level, how intensely the CPU is working etc, I would suspect a bad connection somewhere, which might require a repair under warranty.
