Spotify has worked fine for years, but over the past few months I've started seeing the "No Internet connection available" message much more consistently despite having both a cell and wifi connection (I'm posting from that phone right now with Spotify displaying that message).
I've followed the advice in other similar threads on here and: restarted my phone, reinstalled Spotify, and cleared the cache. Those things have sometimes fixed the problem for a few hours and then it comes back. Switching off wifi seems to help most consistently, but this problem has occurred on multiple wifi networks, so I know it's not just my home router's fault.
I'm on Spotify Premium on a Pixel 2 running Android 10.