There is a huge difference in frequency of Bluetooth audio dropouts depending on what sending device you use the EARIN earbuds with, and depending on the Bluetooth situation.
The sound cuts out temporarily if the connection is lost for longer than the earbuds’ buffer can compensate for. The single most important factor is the distance between the sending device and the master earbud (left earbud). Bluetooth signals do not cross through the body. To to get really good Bluetooth connectivity, have the sending device placed close to the left earbud, for example in your left shirt pocket or in a jogger armband on your left arm.
Bluetooth signal strength varies based on the surrounding environment. It is generally stronger indoors, where it benefits from signals reflecting off walls and other objects.
If you still experience dropouts when already having the sending device close to the left earbud, it is likely because your phone's Bluetooth and WiFi antenna do not have enough capacity for all the processes simultaneously running at that time. If that is the case, you can turn off WiFi/GPS, disconnect other Bluetooth devices from your sending device, and make sure to listen to locally stored music instead of streamed music.