my system seems broken

Since the new app updated, I have a multitude of issues. Music lags, volume adjustment lags, adding speakers or zones lag. Music cuts out continually. Is thus because I have several older units? (play:3 and play:1) have done a system reboot. Unplugged all Sonos products (18 in all) shut down router and internet connection for 10 minutes. Restarted internet and router. Waited another 10 minutes and plugged in all Sonia products. It fixed nothing. I’m trying to roll back to the old app (s1) and it looks like I have to down grade every speaker?  Which means factory resetting each one and setting up the entire system from scratch.  I’m more than frustrated that I spent so much money building my system and now it is unusable. I have no need for some of the newer features… I just want to open the app, choose music and choose rooms to play it in.