Could you give us more informations about your clients ? (Smartphones, laptops ? Which model ? Quantities ?)
What you're relating here seems to be linked with roaming issues (still connected on a far away AP, even if there's another one with better signal available. The action to disconnect/reconnect is kind of forcing the new connection on the nearest AP)
I suppose you're talking about a VoWiFi environment ?
So I forced clients to connect with 5 ghz band only for my Corp SSID also disabled auto channel width and selected 20 Mhz. Worked like a charm. Only the b & g clients were affected for which we have already replaced their laptops. Dual band still enabled for Guest SSID as ppl still use some phones with 2.4
ps. VoIP over WiFi is always painfull because you don't have control over the RF. It can run great for six months, and then someone shifts in next door, upgrades their WiFi upstairs, etc, and your VoIP over WiFi degrades - completely outside of your control. Often you can't fix it - apart from putting in more and more APs. And then sometimes the VoIP devices don't roam properly and you get another wave of issues.
Did you also happen to upgrade to 25.14 in the last week that you started having issues? Might want to roll-back to 25.13 or upgrade to 26.6 and see how things go. I've seen too many issues now with 25.14 for me to go to it.