I'm not sure if this is a bug, but we're using the same Spark version and our Spark away & available is working properly.
Did you install the client control plugin?
This must be enabled if you installed it.
I hope it helps.
Let's wait for the others, they might have something to share how to fix your Spark issue
It is hard to reproduce, therefore hard to fix. Clean reinstall and profile wipe seems to help, but sometimes the problem still comes back.