Is UPnP a rubish protocol ???

[lyapounov]

OK, this title is provocative.

However: I have constant issues with UPnP; unless it is me.

In my home network, I have everything under a neat subnetwork, including synology with minimserver, of course, and a Linn equipment, so openHome compatible.

Every so and so, roughly every hour if not every half hour, the Lumin app has lost the player. I need to stop the app by swipping up, and to restart the app, and then, magic, the player is back again.

Sometimes (every two months) even this is not sufficient. I need to stop and start my router to get the player visible again. Sometimes, it is minimserver which disappear. Sometimes, even both minimserver and the player.

Now, I am currently nomadic. So I bought a sonos loudspeaker, and I access my music remotly using ds-audio app, or sonos app with qobuz integrated. Well, even with the sonos app, suddenly the loudspeaker has gone away. After three attempts to access to it again, Sonos tells you "just reboot your router". O well...

I have never experienced this sort of issue when I deal with my network; all protocol such as DHCP, SFTP, SSH, etc. work seemlessly, TCP/UDP work well; no such issue.

So is it me who carries bad luck, is it me who is incompetent, or is this that UPnP is just a rubish protocol ?