ZHA TS0012 not working correctly

Hello,

I’m using ZHA and added two 2-way switches (TS0012: BSEED Zigbee Smart EU UK RU Einzigen Live Touch Licht Schalter Alexa Smart Lebensdauer Kompatibel Mit Normalen Buchse Hause Dekoration|Switches| - AliExpress) today.
Now I have the problem that sometimes they don’t work correctly.
Sometimes they work very fast then suddnely react very slow, or it switches off/on but in ZHA it says its still on/off or if I turn on/off both sometimes only one gets switched, so basically they often behave weirdly,.

Does someone have an idea what it could be? In ZHA Log, i found no errors.