I get a crash on launch often. But it rarely crashes while using it for me. It could be the type of post that’s causing issues. I remember Apollo had that problem. Whenever someone would post a new format or graphic type it would start crashing. So it could be one of the subs you are visiting or subscribed to that are using something new that is causing the issue.
A memory leak in app shouldn’t be capable of impacting system-wide function this way. The application would be forced to close (or crash) at the OS level before being allowed to. I wonder if there is an OS bug you’re seeing which is manifesting most readily in Avelon?