Same issue here, in dmesg I see some errors, I think those two are important:
[ 11.384685] ahci 0001:11:00.0: controller reset failed (0xffffffff)
[ 12.951128] rk-pcie fe170000.pcie: PCIe Link Fail, LTSSM is 0x3, hw_retries=0
Everyting except SATA works fine.
On some cold boots everything works fine.