Holes in Infill

I am running PA tuning right now with 15% infill and i discovered something that looks like underextrusion in the infill. Anyone has an idea what could be the cause?

I am using PLA for printing and am kinda struggling to get consistent and good results
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Solution
It was a mixture of overcooling and too high printspeeds. Regular (not High Speed PLA) is hard to dial in. had to lower speeds to 80-100 to get some good results here. Cooling at max is 30% (part cooler is too STRONK! )
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