The current usage of Umbrel with respect to excessive memory consumption is mostly related to LNDg.
I have recently increased from 8 to 16GB of RAM but it is still not enough to maintain a good comfortable hygiene.
To fix it, I am forced to restart that application by command line. Sometimes I get caught distracted and get my node locked up.
What I propose is that in each app installed, there should be a reset button that can pass through 3 colors, green, yellow and red so that the user can act on that app without having to restart the entire node.