routerOS:
system package update check-for-updates
channel: stable
installed-version: 6.49.4
latest-version: 6.49.4
status: System is already up to date
I already determined it is caused by the
open-vpn client/interface - see my comment above. Next step is to find how to stop this from using up the memory.
What routerOS version do you run? Have you tried upgrade/downgrade?
If you use DoH, try to disable it, and see what happens. For me with one DoH provider i did get saw tooth pattern, see link to Sindy.
Even if memory goes up/down, it worked. Change to other DoH provider fixed my problem.