It has been raised and suggested by several users for many, many years yet Sonos does not seem to be receptive.
It’s a huge paradox there is no central reboot feature in the app when reboot is the first and foremost default remedy suggested by Sonos support. I can’t think of any issue (and there are quite many) that hasn’t been responded to by Sonos: try to 1) reboot your Sonos system, 2) reboot your router. Whatever the problem, try a reboot and let us know if it didn’t work.
The latter is easy, my FRITZ box interface has that feature. However for Sonos reboot I have to climb and crawle the entire house. Up to the ceilings, down on the floors, under furniture, behind shelves. Such a pain, such an annoyance every time.
Ideally, in a perfect world it would be even better to make a system that actually works flawlessly but I’m afraid that is too much to ask for. Fixing the broken app of 2024 is a protracted, neverending story, restoring functionality is a mirage, never mind improving the system.
So yeah, a reboot in app would be a great feature in the absence of a really functioning system.