Just to give an update:
Charging and freezing didn't help so I startet taking it appart.
I desoldered the shields to havev a look on the board but I realised that the board alone draws 200mA so I startet searching for a short.
Relatively quick I realised that the processor (MCIMX6L8DVN10AB) has a little short.
Perhaps it is just a shortet solderball but I dont have the skill and equipment to reball it.
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