When my smart lights randomly flicker after a firmware update—what’s going on?

I recently updated the firmware on my Philips Hue bulbs throughout the house, hoping to fix some lag issues with the app. Instead, now several of them flicker sporadically, especially the ones in the living room and kitchen. I've tried resetting the bulbs and power cycling the bridge, but no luck. The weird part is that the flickering seems to happen mostly when I use voice commands via Alexa, but not when I control them manually through the app.

I’m using the latest version of the Hue app and my Echo Dot is fully updated too. The bulbs are about 2 years old, so not exactly brand new, but they've never acted up like this before. Ideally, I want them to respond smoothly to voice and app controls without flickering.

Has anyone experienced this kind of post-update flicker? Could it be a compatibility bug between Alexa and Hue? Should I try downgrading firmware or is it better to wait for an official fix? Also, are there any reliable ways to diagnose if it’s a network, hardware, or software issue causing this?