@TEN : I'm not aware of any particular exchange program, certainly you could discuss the matter with Google Store support and see what their take is on this particular issue. Not something that I personally have encountered yet, but there have been a number of reports about it on Reddit as you've seen already.
I haven't had any issues but I use the chromecast that came with my controller. Is the problem specific to destiny2? Have you tried using it for non stadia apps? Does it tend to happen randomly or after playing for an extended period of time?