CONNECTION YEELIGHT LIGHTSTRIP

I’ve been using 2 lightstrips for years. Since a few weeks I cannot make a connection anymore.
I’ve tried it for 50 times or more. Nothings helps.
My phone shows the mac adresses of the strips. After that the app is searching and it displays:
Device disconnected or ‘time out’.
What is the best solution for this? Buying Hue from Philips?

Hello, Try change the DNS of your router to 8.8.8.8. If your router support DNS over Https(DoH), turn it on.

Hi there, I’ve changed the primary DNS to 8.8.8.8 and the secundary to 8.8.4.4
The router does not support DoH. It worked well for years without that…
After 50% it continues saying: device disconnected.