ChannelError.ioOnClosedChannel

[JunyuKuang]

Hello,

I'm getting ChannelError.ioOnClosedChannel about every 20~30 mins when sending a push.
Is this an expected behavior?

Currently whenever I receive this error, I create a new APNSwiftConnection and close the old one. So far so good, but I'm worrying that Apple may blocks my server, as mentioned in Apple doc:

If your provider server opens and closes its connection to APNs repeatedly, APNs may treat it as a denial-of-service attack and temporarily block your server from connecting.