You guys do realize there are two apps. The ancient one for iOS 5 that I suspect you're using, and the newer one that replaced it long ago. I've gotten the connection error on the ancient one once in a while. New one works much better.
I've been experiencing intermittent issues with the app known as "Optik TV Remote Recording" (version 1.5). Using iPhone 7 Plus with iOS 10.1.1.
When it doesn't work I get the error messages "Channel data currently not available. Please try again later." or "Connection currently unavailable." - sometimes one follows the other.
I called Telus today (November 21) and they say it could be that my device and iOS are so new, they haven't caught up with a new version of the app.
However it was suggested on here to use "Optik Smart Remote" and that, so far, is working fine. Might just delete the other app in favour of this one. Plus it was last updated, January 2016, as opposed to the other one which was January 2012.
Waiting on a call back from Telus though as they delve further into the issue. Whatever they tell me, I'll post here.
In a follow-up to my last post - just got off the phone with Telus. The "older" app (the one not updated since January 2012) is toast. It's going to be phased out soon, if it hasn't already. Looking at the Smartphone Apps Add-on page, it's not even there anymore.
What I was told is that the "newer" app aka Optik Smart Remote (last updated in January 2016) will also be phased out. The one app that will encompass everything will be "Optik on the go".
Hope this helps some people.