WS2811 problems

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I am having problems with the WS2811 LED Strips and need some help.

The strips are 12v and are ran from an ATX power supply. When each strip is on a breadboard connected to a Teensy 3.1 individually, everything worked fine. However, I moved everything from a breadboard to a more permanent solution and when I plugged all the strips in, I am getting some serious glitching on 2 of 3 strips. On one strip, only the first few LEDs are on then it seems like there is a voltage drop and the leds get progressively darker to the point where the rest of the strip doesn't light up. The other strip just flashes a lot and can only hold certain colors without glitching out.

Any suggestions?

Specs on the power supply: 12V 25A rating
Running 3 strips of 3-5 meters each
Purchased strips from here: http://www.aliexpress.com/item/5M-3...trip-5050-SMD-Waterproof-IP67/2020909892.html
 
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