Hue Bulbs Disconnecting Overnight - Any Solutions?

Hey everyone, I’m hoping someone can shed some light on this puzzling issue I’m facing with my Hue bulbs. I’ve had them paired with my Home Assistant setup for months now, and everything was working smoothly until recently. Overnight, all my Hue bulbs disconnected from the system. The app shows they’re on, but the actual bulbs aren’t responding, and the boiler isn’t starting up as it should. I’m at a loss for what could be causing this sudden disconnection.

I’ve checked my Zigbee network, and all my other devices, like the Sengled and Innr bulbs, are still functioning perfectly. That makes me think the issue is specific to the Hue bulbs. I’ve tried resetting them and attempting to pair them again, but without a Hue bridge, I’m not sure how to proceed. Has anyone else experienced something similar or have any advice on how to get these bulbs back online?

I’d really appreciate any tips or solutions the community might have to resolve this issue. Thanks in advance for your help!