Hey :) I think you're the one that I talked to on /r/Brasil (judging from the nickname and phone model!). So, I delved into it and it seems some phones need gyro recalibration:
www.wikihow.com/Calibrate-the-Gyroscope-on-a-Galaxy...
this is a Galaxy phone specific tutorial, but you can also try third party apps that do that. Apparently phone gyros have to be readjusted from time to time õ_ō Living and learning.
Let me know if that works!