You have either a wiring problem , strip problem, or driver problem. And as far as the comment being in parallel is nonsense. That's been proven time and time again. Ontop of the 70+ lights I've built in parallel that are still running nonstop for the last 2+ years. The biggest thought was thermal runaway. But that's been shown not to be an issue. I have yet to see an actual case of true thermal runaway on a DIY light that was built correctly. I have 21+ years of electrical work in residential, commerical, and industrial wiring. With 9 years of led experience at my current job now. I have 2 year degree in electrical technology dealing with low voltage and automation, and 4 years of electrical engineering classes at my state university. As well as growing and building with leds from the first set of slug diode based leds. You definitely need a multimeter. To check voltage and current readings. All those displays have and use power to run and are not exact. It's better to use a meter and get actual readings. At the source. Not saying those things aren't handy bc they are I use them. But for actual readings always use a meter.
