No.
In stamina mode anyway, it's the background data restricted but wifi keeps connected, as far as I can tell.
The disconnects I'm taking about happen sometimes during screen off. I notice on turning screen on that only 4G is on, and wifi then reconnects after a few seconds.
Seems to be happening very occasionally, like once or twice a week. No disconnects on other devices. I tried an app called wifi keep alive and it prevented it, but I shouldn't have to use it.
