Connecting LED strip with long cable (10 metres)
Those addressable LEDs are pretty sensitive to timing, and with cables that long you could easily be running into signal integrity issues. Long cables mean high capacitance, resulting in those pretty digital square waves becoming blurry. 

If it's within your power to do so, some kind of differential signaling conversion scheme would probably be the best approach (I'm thinking of something like RS-485). You can get a interface transceivers to go from UART to RS-485, but you'd need controllers on both sides of the cable, and a layer of software to trans-code data over the link on to the LED strips.