USB3.x and AC-Coupling Caps on the RX lines
AC coupling capacitors are essentially high pass filters with a cutoff frequency of \$\frac{1}{2\pi R C}\$ where \$R\$ is the input impedance after your blocking capacitor to whatever network/chip comes next. If your capacitor is too small for the network's input impedance, it will basically filter out the content of you are trying to transmit.