Recently we've had four crash reports with OOM errors. Three of the errors had the Rome RSS library in the stacktrace; the fourth happened in UI code but the log showed that Rome had recently thrown a parsing exception. We upgraded Rome from 1.7.3 to 1.10.0 in ccbeee60 (included in Briar 1.1.3).
I suspect the problem is this bug, which was fixed in Rome 1.12.0, so upgrading may fix the issue.
Upgrading Rome didn't fix the issue. We've had 23 OOM reports with various stacktraces in versions 1.1.7 to 1.2.3 beta.