The only thing I can think of is that this sounds like the bizarre behaviors my other wireless controllers start to show when the battery gets low. Can you try these two things?
1) Charge the controller fully until the orange charging light turns off.
2) If you can, try using the controller wired via USB on a PC via the chrome browser and see if the issue persists while it is wired.
I have this same issue. It comes back about every 90 seconds or so. Very frustrating and basically makes first-person games unplayable.
I've got Google Fiber here, and the router is about 15 feet away with only air in between us so I don't think it's a signal strength issue. I'm also the only user of this router and all my other devices are off (except my cell phone), so I don't think it's interference either.
We have the same problem: https://community.stadia.com/t5/The-Stadia-Controller/Controller-stops-working-in-Destiny/m-p/3665/h...
I have the same problem in Destiny 2.