Frontend stops receiving Events from backend

[stuartm]

This has been a issue for a while in master.

After a period of use the frontend no longer receives any events from the backend. It's as though it loses the event socket connection and doesn't try to re-establish it.

This manifests in the frontend not updating filesizes for in-progress recordings; failing to displaying new recordings or changes in recording status in the recording list; the guide not updating to reflect recording status after creating a new schedules. i.e. Any update in the frontend driven by a backend event fails to occur.

You can still use the frontend. Exiting and re-entering playbackbox causes the recording list to be reloaded but the issue with events isn't resolved unless you restart the frontend.