I ran in that same issue when I tried to use the simple text editor. It does not show the hidden " .storage" folder. Virtual studio code will show it.
Open the application menu (hamburger menu) → files->Open Folder (Ctrl+O) → Select the /config/.storage/ folder via the selection box.
for why this is happening, my guess:
When the server restart the dockers DHCP server has to assign new IP addresses and the order of readiness decides who gets what IP. (a race condition?). I think Docker has a local DNS as well so if can point to the containers name this should not be a issue anymore. I have not tried that yet.
I hope someone with more knowledge about this topic can try this or say something smart about it.