DG40S / DG40SA - Troubleshooting - Short range, audio cuts


Keywords: DG40S, short range, audio cut


Key Questions to Ask:

1. Did you place the dongle at the back USB port of computer? Move it to the front port, how is  the result?

2. Did you plug it to USB 3.0 port, try to USB 2.0 port, how is the result?

3. Is there some wireless interference close to dongle? Wifi router or cordless telephone sets nearby? 

4. Is there a wall or people between the dongle and your BT devices?  Physical obstructions will block the Bluetooth signal.

5. Did you try to pair it again, how is the result?

6. Did your device connect to your phones and dongle simultaneously?Turn off the Phone's Bluetooth, how is the result?

7. Did you try another device? Same result? Please give us the product Brand and Model.

8. Do you use the dongle with 2 devices simultaneously? How is the range to use with 1 device? 


If the dongle isn't reaching as far as you were hoping, there are multiple reasons -

Bluetooth by nature is a short range wireless communication standard. It was originally intended for connecting nearby objects like keyboards and telephone headsets. Standard class II Bluetooth devices on the market offers up to 10 meters / 33 feet line of sight / in open space.

If you experience much shorter range, here are some possible causes - 

1. Radio Interferences

The most likely cause is radio interference in the environment. Some possible source of radio interference are the following:

1.1 USB 3.0 ports

An Intel white paper also confirmed that poorly shielded USB 3.0 ports (Blue Color USB) will cause radio interference. If your device is having range issues when plugged into a USB 3.0 port, a USB 2.0 extension cable can help.

1.2 Wifi

Wifi can be a problem if there are multiple access points in the vicinity using different channels. Smart TV, TV stick such as Roku, Wireless router... can all interfere with Bluetooth transmission. 

Wifi is much stronger than Bluetooth. When operating, Bluetooth takes note of the frequencies used by nearby wifi access points and avoids using those frequencies, so this becomes a problem when multiple strong wifi signals leave no available frequencies for Bluetooth. 

1.3 Other stuff

Other possible sources of interference are cordless telephone sets and wireless security cameras and things like baby monitors that are wireless. Most wireless consumer products use the same frequencies as Bluetooth and Wifi. 

Solutions - You can also try using a USB 2.0 extension cable to move the adapter away from the port. This also has the advantage of allowing you to place the adapter in a higher location, which often helps with range. 

2. Reception Bluetooth Item Design

You normally experience a much better range when using with a big over ear headphones rather than small Bluetooth earbuds. Bluetooth range is also related to the antenna design of the reception device. 

(Add comparison table of 4-5 different type of Bluetooth items here)

3. One off unstable connection

Sometimes, this could be the cause. All you need to do is to delete the pairing and try to pair again. 

4. Reception Device is multi-paired

If your Bluetooth headphones are multiple paired to other Bluetooth device at the same time, it also could cause some signal instability. Same as 3, we suggest you to Clear Pairing History of the headphone and pair it again with the dongle and see. 

5. Outlier Item

Of course, it could also be that the adapter is not within our standard in some way. If the adapter itself is defective, we will send a replacement right away. Please contact support@avantree.com


We also offer LONG RANGE Class I Bluetooth Transmitter (up to 300feet / 100m in open air) devices to support special long range requirements - 



  • For Computer / USB Audio - Avantree Leaf (USB Bluetooth audio dongle, 80 feet)
  • For TV / Other audio source - Avantree Oasis, Audikast, Priva III ... 
Have more questions? Submit a request