This answer applies to R1 Mk3
If this happens firstly ensure that the device you are streaming from is within the recommended wireless range of 5-10m. If the problem still persists then this may indicate a temporary system conflict.
To resolve this we recommend that you perform a System/Factory reset on your product (how to do this is explained elsewhere in our Q&As) and also clear all references to your product on the device that you want to connect. Once this has been done, your device will again need to be freshly paired but once done you should find that Bluetooth playback is free of glitches.
If not, please do not hesitate to contact us via our support enquiry form.