Periodic noise peaks in Ganglion board with native bluetooth
Hi! We're students making a final project with EMG signals for our university and we're using a Ganglion board that the university gave us to do it. Until now we were using only the channel1 for testing purposes and everything went ok but now we are trying to use all 4 channels to amplify our muscle signal but we discovered that channel 2 and 3 have periodic noise peaks with and without the electrode cables connected to it. Channel 1 and 4 seems to work fine for now. It seems that the noise peaks are time synched with some packets lost (we saw 2 packet loses for each noise peak involving channel 2 and 3). We searched in the OpenBCI page and forum for answers but we couldn't solve the problem. The only big issue that we think could be the problem is that we are using the native bluetooth option because we don't have the BLE dongle that is mentioned in the official page, could it be that the native bluetooth connection with the Ganglion board is causing these big periodic noises in channel 2 and 3? We also used different computers and operating systems, we updated the software version to the latest (3.0.2) and always used the last version of the GUI.
Here there is a video of the noises we're facing with, the board has no cables connected to ir, only the battery: https://drive.google.com/file/d/1I_bYgbaa_-fr26ljIqFEcgTEda7HCiZV/view?usp=sharing
The initial setup is this: