Hupe only works sometimes

Hay her love I recently got myself a lupo 1.0 with 50ps The car is still great in the shot but I have a problem with the horny times she works and sometimes not example: from 30 times the horn it works only 6 times instead of 30 times The grinding ring is in order, a relay you hear too and horny I have already renewed But the problem is still Has someone possibly had the same problem or someone possibly an idea Thanks in advance