Those who deal with #Android apps such as #AntennaPod getting killed all the time on #GrapheneOS while running in the background should consider disabling "Secure App spawning" (Settings -> Security & Privacy -> Exploit protection). I have been wondering months about how to get this sorted out and apparently so have many other users if you take a look at the AntennaPod issue tracker.
Keep in mind that you lose a significant security advantage of GrapheneOS when disabling the feature. Learn more about it here: https://grapheneos.org/usage#exec-spawning