Problems with AirPlay

If you want to see a current status of the wifi network you can run a diagnostic report on your Mac by using istumbler or similar. It will give you values for signal strength and any noise detected as well as any nearby networks.

You can also try wiring the Apple TV via Ethernet to help rule out wifi issues

It would be streaming from your device over the local network to the router and then being sent to the Apple TV. Placement is a factor for both and neither should be obscured.

Running the diagnostic would give the best picture, to see how stable the network is at the current time.

Of note with choosing bands bands for the router. 2.4ghz has great range but is prone to interference as most devices run on that frequency. Along with placement, other factors can include how many wireless devices are in the area as well as other appliances running on the frequency including Bluetooth, microwaves, cordless phones etc. 5ghz won’t have that issue but has considerably less range.

You can also try changing channels on the router. Make sure it’s up to date. The age of it can also be a factor.

Yes it could be your wifi network. Working fine on everything else doesn’t eliminate it not doing so on another device.

troubleshoot your network.

Make sure the cables and cords are secured tightly,

the modem is not obscured by anything or down low on the floor etc.

Unplug it for one minute so it can reset.

If it persists, some, if not most, wifi modems run on Duel bands and removing one and making only one the default can help considerably.

you could also restart your Apple TV or unplug for a minute.

make sure you are on the same network on Apple TV and the device you are using.

Thanks for that. It does look ok so far. However, I notice that it is set on the 5Ghz frequency, which has pretty limited range. Try switching it to 2.4Ghz. Also try changing channels on your router. (refer to your router manual if unsure on how to do this)

Lastly, and before testing hardware, I would take it to another location to verify if the issue persists on another network.

I have tested myself using a much older Mac and cannot replicate and know others who can also attest to that as well, so it wouldn't simply be an issue of the hardware, if anything it could be a defect that has come upon your particular laptop.

Yes and Spotify and safari servers can be problematic as well.

From whatever device you are using I’d delete the internet cache. It’s a good rule of thumb to do this on a regular bash’s, it will sign you out of everything though. All that clutter it accumulates slows loading times.

Restart all devices including ATV.

reset network settings.

If possible delete the Spotify app and reinstall.

good luck!

it might be your wifi has dual bands and the solution to that is to disable one and set only one to be the default

I had to disable the 5G on mine because my printer only works on 4G. I can still use my 5 G. Everything runs so much better now.

There are a lot of variables to consider when trying to troubleshoot a wireless network. When streaming via app it is basic airplay and simply sending the media directly to Apple TV whereas mirroring is sending out the device’s full display in real time. The latter is a much more intensive task.

Unlikely to be server related nor should deleting the cache be required. This usually comes down to troubleshooting the network.

Was just some additional ideas to consider.

I agree to troubleshoot the network. As mentioned above in my first reply -)