Roamio Streaming/Downloading problems to iOS devices

I have never had consistent behavior either streaming or downloading from my Roamio to my ipad/iphones.

Usually downloads will start just fine. Then anywhere from 1minute to 10minutes or whatever in, I will get various different "Problems downloading"... sometimes, just clicking on try again will restart, but usually not. Sometimes killing and restarting the app will resume, but then inevitably pause again. sometimes going through the "Setup Streaming" will fix it temporarily, but again, will almost always fail again. Pretty much I can never download a show, even at basic or medium quality, even just a 30 minute sitcom, without a failure.

Streaming in home will usually work, at least until I push fast forward/30 second skip too many times, then it just crashes and often won't restart the stream. OOH streaming hardly ever works.

I have 2 different iPads - latest iPad Air2 seems to work best, but not at all well. I think once in past couple of years have I ever been able to transfer a show all at once. Also have 2 iPhones (SE and 6s) - neither work. All have latest updates of App and iOS installed

TiVo I have tried connected wired to my router (which is what it usually is) as well as WiFi. Rebooting either TiVo and/or phones/iPads makes no difference.

I do have a TiVo Mini that streams flawlessly from the TiVo Roamio. I can stream NetFlix, Hulu, etc. at highest quality flawlessly. LogMeIn I can access external to my LAN flawlessly. It is 100% TiVo Roamio/app combination that gives me these problems. I have loved TiVo for so long and was sold on the Roamio for these streaming/download capabilities and every trip I take to try to take a show on the plane or watch it remotely just makes me scream in frustration.

Any thoughts? Any router settings I should be looking at? (I should note I have <6 month old new router - behaves same on this NetGear as it did on previous Linksys)...

Thanks!!