Have the same problem, have you managed to get a fix on this one? :)

I’m not sure if this is the issue, but I found another thread in which USB devices can randomly disconnect due to power saving settings.  There are two places to look.  The first is under Device Manager>Bluetooth.  Right each bluetooth controller and look for power management settings.  In here, there will be a box that states “Allow the computer to turn off this device to save power.”  Turn that off.  This setting was removed in Windows 10 after 2004, so I didn’t have this setting.  The workaround here is to go into Human Interface Devices, this is were I saw my Razer Blackshark V2 Pro.  I right clicked it and disabled that setting.  In fact, I disabled this setting on all of my controllers because I have no need to have my computer randomly turn off my connected devices.  I haven’t tried it out much yet, but it seems like this could fix the issue as it’s likely Windows is prioritizing power over having a wireless connected device.  Hope this helps someone!

 

Disabling the power settings option unfortunately didn’t fix my issue.  However, I did run the Device Connection Troubleshooter found here https://mysupport.razer.com/app/answers/detail/a_id/5776/~/how-to-use-the-device-detection-troubleshoot-tool.  This tool goes through and uninstalls the drivers for USB and HID devices and walks through a full install of Synapse again.  I had a full session last night without any disconnects.  I’ll try and update here if that changes.