Stairville Z120M Par 64 LED RGBW 120W

We bought 4 of these, for a summer tour, we are a small theatre production company. They are light weighted, relatively strong lights, good for many colors.
As a result: 2 of them broke in 1 week, we sent them back and get them after 15 days (Thomann service is fine!), so we left the other 2 we were afraid they may break in the middle of the tour.
We used them again these days for a Christmas show, the other 2 broke again.
So, my opinion is that we lost 1200 euros, they are not reliable, too bad for the brand Stairville (we have other Stairville articles and they work fine).