It is likely the bulb and not the integration that is the cause.
Make a successive test by switching some bulbs around.
If the error follows the bulb, then the bulb is having issues and might need replacement.
If the error does not follow the bulb, then you have issues with the signal in that area. Something might be blocking the signal or jamming it or the location is to far from the rest of the Hue/Zigbee network.
I just received a new update for my hue hub and now my bulb goes unavailable too.
They come back after some seconds though.
It installed the update manually and experienced the drop out right away, where the network were rock stable before.
I have a Lovelace card with just hue availablity status listed from the hue devices, so it is easy for me too see the difference.