Convexa B can no longer mesh after 3.203 update

Hi, I have two Convexa-Bs that I use in mesh mode.

But after upgrading the firmware to 3.203, the two of them will no longer mesh.
I’ve tried resetting both routers and tried to re-setup the mesh, but no matter how many times I try to set them up, they just won’t mesh anymore.

The main node also drops SSID multiple times a day now. They just randomly disappear and reappear again after a short while.

Any help would be appreciated, thank you.

Just to link all the conversations together:

Downgrading to 3.105 fixes the mesh issue.

I had to reset and downgrade the main and sub nodes, and immediately after that mesh works fine.

I don’t think I’ll upgrade again for a long time haha.