I literally just deleted and re-added my xfinity tve 2 days ago and yet we’re back with the discovery networks issue. It works fine when I go direct to the website and access the stream. Is there any way to keep ahead of this? If it’s a chrome issue can it be updated?
You may want to post what channels are getting what errors and submit diagnostics from the DVR server.
I started proactively removing and readding TVE every two weeks to prevent my DIY channel recordings from failing. So far, so good. 
I go a step further by changing the pw each time I remove and readd it, and I try to do it weekly, but sometimes I forget, and they stop working eventually.