Thanks for your feedback. If the issue is affected as the volume changes. Please know that source devices (phones, tablets, etc.) all behave a bit differently. Some have very loud outputs, and some can be quite a bit lower, even at maximum volumes. The same goes for individual songs; some are louder than others. It is possible that the output level of your source device or song causes the unit to reach maximum undistorted volume before actually reaching 100% on the volume control. So, if the issue only occurs when the volume is getting near maximum, this would confirm that the issue is the result of an extremely loud source device or song recording. On the other hand, if you are using an Equalizer (EQ) to boost frequencies, this has the same effect as increasing the volume. Try turning the EQ off. If the sound no longer distorts with the EQ off, the speaker is not damaged, and the EQ settings need to be adjusted to prevent distortion and eventual damage. Next, try to connect a different device to the speaker to determine if the problem is with the device or the speaker. Last is reset, turn on the speaker, then press and hold "Volume +" and "Play" for more than 10 seconds. The speaker will turn off and reboot to factory default. You may need to 'forget' the speaker in Bluetooth settings on your phone/tablet in order to pair it again. If the issue remains, please contact us for further assistance.