Even though this shouldn't be a problem, that I can see, try putting your variables into the loop if they're not already. I had a simular situation where the loop would only run once then stop, but if I put the variables I used in the loop it worked. If not, then I'm out of idea's. Good luck, though!

I don't know if this is under the right section, but since I'm a beginner and complete noob in all of this, why not. So, this Saturday I purchased my own Raspberry Pi 3 B model set (including case, wires, etc.) and a Raspberry Pi Zero with the essential kit along with a sense HAT at the party for it...