I recently purchased a Razer Basilisk V4 Pro and the corresponding Mouse Dock V2 Pro.
I get random disconnects when using the mouse dock V2 Pro. I must cycle power on the mouse or unplug the mouse dock and plug it back in for the mouse to begin working again.
I assumed I received a defective pair, so I went ahead and sent the Razer V4 Pro and Mouse Dock V2 pro back to Amazon and asked for replacements.
I received the replacements today, brand new in the box Basilisk V4 pro and dock v2 pro.
I uninstalled Razer synapse 4 and downloaded a razer driver cleanup program. I made sure all of the Razer Mice and docks were unplugged from my computer etc. Rebooted.
I then installed Synapse 4, prior to plugging in the new basilisk v4 pro and mouse dock v2 pro.
After synapse 4 was installed I restarted my pc just to be safe.
At that point I went ahead and plugged in the mouse dock, watched Synapse as it installed the drivers. Once it was done, I went ahead and turned on the basilisk v4 pro and used a separate Logitech mouse to pair the mouse to the dock.
After all drivers were done installing, I rebooted my PC.
In less than 10 minutes the basilisk V4 pro stopped working. The left and right click work but the curser would not move on my screen. I had to reboot the mouse to get it to move the cursor again. In fact, as I am typing this my mouse quit working again.
I do note that in Synapse 4, even though the mouse has completely stopped working, other than left and right click, both the mouse and dock remain visible in Synapse 4 as if there are no problems. The RGB on both the mouse and the dock remain exactly the same as I had left it. So, everything else pertaining to the mouse seems unaffected other than the mouse is no longer controlling the curser at all until I reboot the mouse or unplug and plug back in the mouse dock v2 pro.
There is clearly something wrong that needs a firmware update as I have experienced the exact same problem with two basilisk V4 pros and mouse dock V2 pros, days apart.