GNDPLL0 and GNDPLL1
I believe that GNDPLL0 and GNDPLL1 should not be tied to ground.
The sysCLOCK PLL has the DC ground connection made on the FPGA, so the external PLL ground connection (GNDPLL) must NOT be connected to the board’s ground. From: iCE40 sysCLOCK PLL Design and Usage Guide, TN1251, Mar '15, p. 18.