I have an application that has run for 12 days without wedging–this
exact application (no changes) used to hang after no more than 3 days,
it uses only audio source/sinks.
So, some combination of up-to-date Gnu Radio, and up-to-date system
patches appears to have cured (at least in this instance) applications
hanging after a few days.
Shirleys Bay Radio Astronomy Consortium