Is it possible that you record a video and send me in personal inbox(discuss)? showing exactly what you are doing by reproducing the issue. Doing it so I could easily determine an exit for you. (youtube or something accessible).
Are you using docker? At first print I see an unusual IP: “10.10.18.71”.
Another detail.
Its specs say it has 8GB of memory. Is not that too small for your operating system? possibly + docker + some other software + browser and etc?
In practice you have very few RDFs (Supposedly 12k, that’s very small, should not be a problem). 2GB for the Dgraph is more than enough. So there’s something you’re doing that does not fit.
Cheers.