Cant get ambilight to work stable

Need help please.

Short history of my ambilight attempts.

Set up the whole system and got it to work 5 weeks ago. My grabber became "unstable" after 3 weeks, ultimatly dying in week 4. Maybe overheated. Bought another grabber, which had the empia 28xx chipset inside. Not supported, but it worked. The casing couldnt be opened, so i sold it after some days (cause i wanted to attach a heatsink).when i got a new utv007-grabber
My newst 007-grabber worked out of the box, but only for ONE evening. Now when i screenshot, i get green lines AGAIN (that was the case with my dead first grabber, too).

My question: why did my grabber die again, after one evening?

Every device got a seperate 5v usb adapter, 1.5 amp.

Is there any way to get some kind of a software log file to see where the problem is ?

Was am Grabber ankommt weiß ich nicht, der hängt ja am Pi und hat keinen separaten Stromanschluss. Oder .... sollte da einer rangelötet werden....oder ganz anders?

Pi und HDMI=> AV haben ein 2A NT, Splitter 1,5A.

2.5 nur für den pi ?? Hätte ich nie vermutet. Ich probiere es aus , danke.