There are known problems, smartthings engineering is aware of it, they are working on it. There is no timeline yet for the fix.
Because they are working on it, things may change. It might get better for a while, and then get worse again.
There’s nothing that a customer can do one way or another to make it better.
But until an official fix is announced, probably in the following thread, there’s nothing we can do as customers except either be patient or find another way to get a similar result. See the discussion in the following thread.
New SmartThings Alexa skill (2020)
So I’m glad that it’s working for you right now, but I don’t think you can count on it continuing to do so until a fix is officially announced.