I also see a memory issue and it cripples my entire Roon system after 48–72 hours. Only killing Roon Core and restarting that process (or a full reboot of the core) fixes this. It’s maddening and seemed to only become a problem since I upgraded to build 850. Linux Core here running on an Ubuntu Server running on NUC hardware.
Pertinent parts of uname -va
5.11.0-40-generic #44~20.04.2-Ubuntu SMP Tue Oct 26 18:07:44