Under Cabinet led strip lights appear to be different colors/temperatures
It varies dramatically by dimming/color-control method
If we're dealing with multiple modules listening to the same remote, that is a very different picture than common PWM control. If I'm sounding like Geordi LaForge on Star Trek, then you see the problem. There's a lot of tech here.
And I gather from your question that you don't really have the vernacular to get down-and-dirty on the gory details of this system's design.  That, however, is where the problem lies.
If you're dealing with RGBWW or simply WW (adjustable color temp)

in WW's case, that means 2 separate strings, one Warm White and one Cool White.
in RGBWW's case, it has that, plus, Red, Green and Blue.

Typically each of these 2-5 strings is dimmed individually, resulting in a blend of colors. Blending cool white and warm white gives you any color temperature you want, and of course R, G and B let you get funky!
If that's the setup, it's possible that one of the strings has gone out, leaving the remaining string stuck at full-cold or full-warm.  The &quot;flickering&quot; would be consistent with that.
If so, that's likely a simple wire repair.