core: More and more ESPHome devices are falsely disappearing / are offline, but esphome logs shows no errors

The problem

Since about 1 month I’m losing more and more ESPHome devices (which worked fine before) - they suddenly show as offline / not available - even though I can see in the esphome logs that they are connected successfully and report valid data (also the report data api calls are working fine, no errors occuring on the esphome side).

Right now I restarted my home router, and now I have multiple devices with this problem - esphome logs show no issues - but none of the devices are available in the home assistant UI.

I can also ping my devices outgoing from the home assistant server (f.e. via ping t1.local and I can connect the esphome device successfully via telnet).

I deleted the entries and added them again via the integrations UI, but the still keep appearing offline 😦 Also tried to delete the corresponding files in the .storage folder, still doesn’t work - devices are appearing offline 😦

Environment

• Home Assistant Core release with the issue: 0.114.0
• Last working Home Assistant Core release (if known): don’t know, since about 1 month
• Operating environment (OS/Container/Supervised/Core): Linux native
• Integration causing this issue: Esphome
• Link to integration documentation on our website:

Problem-relevant configuration.yaml

# no sepcial configurations

Traceback/Error logs

unfortunately there are no error logs, neither on the esphome side (via debug log level), nor in the home assistant log.

Additional information

Maybe this is related: https://github.com/esphome/issues/issues/1237 ( but I don’t think so, i didnt change any hardware / firmware, only restarted my router and they went offline permanently after router restart).