Hello there and welcome to the Wowza support forum.
Here is a note from Wowza support regarding iOS 8:
We are aware that since iOS8 has been available we have seen several issues relating to video delivery, not just Wowza related, and we have already seen several updates from Apple to resolve many video issues.
At present we are both testing and monitoring the situation however until Apple provide further updates we do also believe there may be on going problems when using iOS8.
All I can suggest at this time is to take further updates when made available by Apple. We are continuing to look at how we can provide workarounds where possible but as this time do not have further updates for iOS8 issues.