In the processes list it shows cgminer using 24% of the CPU (even though its nor connected):
cgminer --bitmain-options 115200:32:8:40:350:4d81 -o stratum+tcp://stratum.bitcoin.cz:3333 -O XxXScarecrowXxX.worker1:LfDacYac --api-listen --api-network
0%
24%
Another idea is that perhaps my ISP is blocking a port? But i doubt it (the antminer works sometimes).