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Yellow dot shown on the Wi-Fi Quality indicator (or scanning is lagging/stuttering)


This is an indication of insufficient network bandwidth. While scanning, the image display will lag (time from movement of probe to seeing the corresponding image is excessive), or appear to stutter (pausing and resuming). To rule out an issue with the hardware, it is recommended to run the Vscan Air diagnostics (be sure the transducer surfaces are clean and free of gel).  If the diagnostics fail, call the appropriate number under the contact us page found under support menu. 

Although there is not much we can do in a challenging Wi-Fi environment, there is at least one option available to try to remedy the situation.  

Lagging/stuttering can occur when the primary channel that was chosen by the probe to establish the network is the same as that of one or more networks in the area, and the existing network congestion is limiting the throughput of the Vscan Air network. 
Additionally, an Android device connected to an existing network prior to pairing with the probe, might negotiate with the probe to form the new network on a primary channel that results in a situation where the Wi-Fi module on the Android device becomes inefficient at managing the throughput of both networks. This is especially the case if the existing connection is a 2.4GHz or a 5GHz UNII-2 network. 

Apple devices


1. Disconnect from the probe by closing the app fully (do not just put it in the background) 
2. When the probe returns to searching (waiting to pair), launch the app and try again (The probe randomly selects a primary channel for iOS devices, and choosing a different one may solve the throughput issue.)

Android devices


1. Disconnect from the probe by closing the app fully (do not just put it in the background) 
2. Navigate to the Wi-Fi section of Settings and turn off "Auto-connect" (may also be called "Auto reconnect") for the SSID, the device is using for network access*
3. Disconnect from the network by turning the Wi-Fi off and then on again**
4. Launch the app and try again (The network will be formed on a random selection of the supported channels the probe and Android device have in common)
5. In the event there is still an indication of insufficient network bandwidth, close the app fully and launch again (a strategy to select a different channel like the one for Apple above). 
* Remember now that auto-connect has been turned off, you need to switch it back on again when finished with Vscan Air. Or you can reconnect to that network manually when finished with Vscan Air.
** Disconnecting from an SSID that utilizes the 2.4GHz band or 5GHz UNII-2 channels when network bandwidth is detected is expected due to shortcomings with radio sharing (maintaining both networks) on the Android devices and the requirements of the Vscan Air probe to use the 5GHz band. UNII-2 channels are required to have the ability to automatically change channels during operation, which is not supported in Vscan Air and would be an unacceptable delay at unpredictable times.

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