I have one instance running on Mint OS but have started showing problem with graphics.
like inject node is inoperable, debug messages not showing, node.status() doesn't show on function nodes and other nodes.
but when left untouched for some time (5 - 8 mins) inject node is operable, debug messages & node.status() shows but there is a delay.
You are running out of memory and the processor is heavily utillised. There is little doubt that is the cause of the problem.
If this started happening when you made a change to the flows then I suggested reverting that change to see if it fixes it. You can start node-red in safe mode, where it runs the editor but not the flows, by using node-red --safe
so you can adjust the flows.
If you don't know what you did then maybe revert to your previous backup. Alternatively disable flow tabs in order to work out where it is going wrong.
You didn't post the full startup log (in future please copy/paste text for logs rather than screenshot), I presume you looked at the rest of it and checked there were no errors.