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SKR 2 fan power issue

Erdogan Guner

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I have connected a Chimera dual nozzle hotend, a TFT35, a heated bed and 3 pwm fans (2 for part cooling on each nozzle) . The problem I'm having is this: if I turn on the cooling fans before a print, they work fine. If they have to turn on during a print, they alternate between turning on and offin about 10 second intervals; when they are on, sometimes they struggle staying on and run at like half speed. It feels like the board is running out of power to spare for the fans, or there's something wrong with the mosfets maybe... I have eliminated the possibility of slicer settings and broken/loose wires. 

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