Hi,
W25Q128FW, also 1.8v. What application do you use to drive em100? Official one from Dediprog or the open linux one? Also, what em100 firmware# you have, perhaps yours is old?
As far as I know, I used the most recent ones: MCU Version: 2.27 FPGA: 0.084 (1.8V) HW Version: 5 Type: EM100PRO
I tried both, the Windows GUI (4.2.28), but also the open linux tool (master) and had similar issues.
Urs