My node trees keep disconnecting themselves.

I have a very simple comp that merges two deep passes together and merges them with a third. Whenever I close resolve and open it up again, the comp is broken. All the nodes are there, they just aren't connected anymore and I have to reconnect them. There must be a reason for this. Any suggestions as to why this might be happening?

Please see the attached image to see what these "disconnections" look like.

Very odd, not seen anything like that before.
I replicated your comp, saved project, re-opened in Resolve and everything was connected as before.
Are you certain the MediaIn2 source has deep data?
Non deep sources can't be fed into a DeepToImage node.
If that source is Deep, then perhaps when re-opening the project Resolve is either not linking that media source correctly, or for some reason does not recognise that it is deep media, so disconnects it.

It's definately a deep pass. I rendered it myself. Also, I don't think it would connect to a "deep to image" node if it wasn't a deep pass.

Well, I'll keep an eye on it. It happens basically every time I open this project.
Weird.

I have had that issue but with pipe routers recently in Fusion Standalone.
I do vaguely remember that I’ve had disconnected nodes in the Fusion Page as well before. But I’m using the Fusion Page very rarely so I just assumed I did something wrong…

If it consistently happens even if you export and reimport that project/timeline then maybe you could send that to BLMD for investigation