External monitor occasionally blinks off/on
 

2019 Macbook Pro
Dell D6000

I have 2 external monitors while using Clamshell mode, the first one is my main monitor and is 2560 x 1440, the second one is 1920 x 1080.

The larger one will occasionally blink off then immediately back on. It takes about 1-2 seconds and can happen twice in 10 seconds or not at all for 30 minutes. It probably happens 30-40 times in a workday. It never occurs on the second smaller monitor.

It is mildly annoying at best but I'm more concerned about the constant off/on/off/on/etc of my nice monitor and the long-term damage. It doesn't happen to a windows computer I'm also connected to (via KVM) so I think it's just an Apple or Dock setting but I haven't found any that stops it (color setting/refresh rate/etc).

If anybody has any ideas to slow or stop it, I'm happy to listen.