Wireless Optik Box and PVR issues after multiple replacements

If you're using Optik 4K PVRs and/or 4K wireless digital boxes, then you for sure should be able to pause live TV for up to 90 minutes. At that point, the show would simply resume from the pause point and you'd be 90 minutes behind live; there shouldn't be any popups or skips to live if things are working properly. Fast forwarding is at the discretion of the content provider, so it may be blocked depending on the channel (most channels are blocked from fast-forwarding live programs that have been paused or restarted). This wouldn't have changed from box to box.

If you're on a high enough internet speed plan (250+), your household account should be able to support 6 concurrent streams (including recordings).

Based on what you describe, there is either something wrong with your account (causing the stream count max) or something going on with your home network that's causing pause buffer/jump to live problems. Do you have any 3rd party networking gear? Mesh networks or switches? Or did a technician install Wi-Fi boosters when you upgraded from copper? Not all of these are compatible with the multicast Optik TV solution.

Unfortunately, Netflix withdrew support for their app on the HD boxes, which were 10+ years old, so to continue watching Netflix, an upgrade was necessary and outside of TELUS's control. 

Our tech support and technicians would be best to diagnose this as they have visibility into your equipment and network.