Unknown Error – PBS: Watch TV & Documentaries Review

I use this app from Portugal via VPN. All is well, I look up the show I want to watch, I hit play. The message reads. Unknown Error. This does not happen on other devices. I tried several times and one day it worked. I watched a few episodes, and then Unknown Error appears again. I uninstalled the app and reinstalled. Still the problem persists. Any advice would be appreciated. Until a month or two ago, I had no problems. I am not sure if this is related to the latest iOS update or if this is device specific. Developer Response: You have not answered the question. I am a 58 year old female without children. I am looking at programs such as Jamestown, Finding ,Your Roots, etc. My membership to PBS is up to date. VPN connected to the US has worked for the last two years and now it has not. Do you know what VPN is? If not, please refer this question to someone who does.
Review by Jazz Gal 05 on PBS: Watch TV & Documentaries.