Greatly disappointed Mttlerweile

I started 2 years ago with this system and had no problems until this year. So reappointed the next expansions and'm shameless disappointed. Of the first 6 lights was a defect directly upon delivery. Receive compensation after 4 weeks. After 2 weeks, broke the next string of lights. Reclaimed again credit again after 4 weeks. But reappointed directly a new chain. Another 2 weeks later the next chain broke. Re-appointed substitute and this was directly already defective. I am already a patient man but also me bursts sometime the Hutschnurr

If I would have a problem with the first chains had so I could not be upgraded, but they are lightning up today