There have in the past been messages going back years about Surface dock issues. None have actually helpful or current answers. I have a Pro 4 and Dock. Recently I have been having problems with a wired USB mouse plugged into the dock. It frequently disconnects and then reconnects. I have second monitor connected to the dock but that doesn't seem to be affected. The mouse works fine when connected directly to the Surface. Any new ideas? (The dock has the latest update installed and my Windows 10 is up to date too).