Termination resistors on SPI clock line
R145 and R146 (both 100 Ohm) should be removed, as IC7 can't properly drive a 50 ohm load. Also, the length of the trace between IC7.B2 and IC8.C (flash mem) is approx. 15 mm which (given the max. SPI lock frequency of ~30 MHz) doesn't require any termination.