For me I've been locked out of watching games which they say is "due to using too many devices" but the system only lets you stream on a single device. In prior seasons, it would simply tell you this when you tried to open a stream. Many times I need to move rooms or devices during the game which is perfectly legit, but their system treats this as abusive behaviour and blocks you.
Last year they started blocking my account meaning I couldn't start a stream on any device - I had to have them manually lift those blocks and they told me the only way to guarantee was to "only ever log in on one device" which is just stupid. The system used to handle this perfectly well, but it has regressed.
Then there's also that full screen doesn't work on iOS devices, there's a huge banner at the bottom of the Cov app that persists when you full screen, which is sort of the opposite of full screen. Oh and rewind no longer works, whereas it used to.
So all in all it feels to me like the service has gotten worse since I first started subscribing - and being blocked so many times last season from using it was the last straw. I'd happily resubscribe if they fix the overly aggressive blocking, but no commitment from them to do it. Seems they're happy to take the money and let the product / experience worsen for the customer. So I'm no longer a customer, regrettably.