No. Shoddy update with Yosemite WiFi issues. Ongoing with El Capitan. Shoddy work with iOS update 9 on going with latest update. It's just shoddy work releasing updates that renders people devices either useless or severely hampered for daily use.
Wow, I ran Yosemite for a year and am running El Capitan right now and my Wi-Fi has never dropped out, get a new router or something.