Some users have reported facing an issue where the Freedrum sensors either stop registering the strokes altogether or play incorrect sounds. According to Freedrum, this could be happening because of one of the following reasons : The drum kit has tilted. The drum kit has drifted.  Sensors are fitted upside down.  Here are the troubleshooting steps to engage with this issue in a safe manner. Freedrum has assured its users that they are working on a fix that will be delivered in a later update. Meanwhile, you can do the following steps to eliminate this issue: 1. Hold your drumsticks still for a second. From time to time, some of the higher-angled hit areas (like the ride cymbal and crash cymbal) will shift downwards. As a result, you will hear the ride cymbal sound when you are expecting to hear the floor tom sound. This can also happen if you are playing too fast.  The best way to fix this alignment error is by holding your drumsticks still for a few seconds and letting the drum kit correct itself. It’s best to do this exercise periodically while playing to make sure the sensors stay aligned properly.  If you still continue to face this issue, try modifying your playstyle a bit. If you are hitting too hard, this may be throwing the sensors off, so perhaps try playing a little softer to see if it resolves it for you.  2. Re-calibrate the sensors by pressing the buttons once. Similar to the previous issue, the kit can start playing incorrect sounds if it has tilted to the right or left accidentally. The only difference now is that you will be hearing a hi-hat sound instead of the snare drum. This is a fairly common issue with gyroscope-based devices, and we’re expecting a solution to these problems in the near future. To fix this alignment error, though, simply point both drumsticks in front of you and press the button once. This will recalibrate both the sensors and fix the orientation of the drum kit.  3. Fix an upside-down sensor. A very common mistake that people make with the Freedrum kit is that they put the sensors upside down. As one can imagine, this will trigger all kinds of incorrect sounds while playing.  The easiest way to remember the correct position of sensors is by checking which direction the LEDs are facing. The LED button should always be facing you whether it is on your feet or your drum sticks.