Hi,
This issue has been plaguing the Surface products - and I'm "glad" to report that the Laptop 4 is also suffering from it.
The problem: When I connect USB peripherals (especially gaming mice and keyboards) to the Surface Dock, they lag and/or hang every X time.
The same issue has been reported for the Surface Book 2 and Laptop 3. I own the latter and I've experienced this issue on that device personally. It has been fixed since, so I'm kind of disappointed to see the same issue on the Laptop 4 now.
To make matters worse, I've also experienced this issue with a Logitech MX Keys keyboard (not a gaming device). Every few minutes, sometimes more often, a key haaaaaaaaaaaaaaaaangs <- and causes stuff like that.
As I understand, the high report rate of gaming devices causes the Dock to disconnect-then-reconnect the usb devices every so often. Another cause I've read about was recent Windows versions powering down USB ports or something like that.
I can confirm that the same Dock (v1, in this case) with a Laptop 3 does not suffer from this issue. It's just the Laptop 4.
The only way to work around it is to connect the device via bluetooth (not always an option as many gaming devices do not have BT) or plug the USB in the laptop (not the Dock). This works for one device, but unfortunately I'm one of those guys who insist on using both a keyboard and a mouse :))
I would really appreciate a fix for this issue. Thanks!
Related support topics (barely scratching the Surface (ha!) here:
https://answers.microsoft.com/en-us/surface/forum/all/mouse-scrolling-lag-surface-dock-connection-issues/bdd8362c-e176-4d37-9298-c21dd260be04
https://answers.microsoft.com/en-us/surface/forum/all/mouse-scrolling-lag-surface-dock-connection-issues/bdd8362c-e176-4d37-9298-c21dd260be04