Hyperion works well for weeks and then begun flickering

Hello, I hope somebody can help me, because i don,t know anymore what to do.

I have installed Hyperion on a raspberry pi 4, and used ws2812 ledstrips to setup the ambilight on my LG tv.

All works fine for weeks.

And then suddenly the led strips begin to flicker very intense. I didn't change anything.

after the flickering i attached more ground wires to the pi, but that doesn't help.

I find this very strange because it was working very wel.

I do see now that there are some led's are light up, even when hyperion is off.

Yes i do use a levelshiter, and i have also checked all cabels, tried other GPIO's but nothing changed.

The lines are no longer then 40 a 50cm, the strips are connected with connectors, the levelshiter is soldered and the pi is connected with a connector.

also tried without levelshifter, but no change.

The last thing i did was a change of power supply, and now it looks like the flickering is over.

But i find it very strange that there were no issues for weeks, and suddly flickering starts.