@wjz304   Thanks for finding the cause.   If so, it seems that u1's libsynonvme.so.1 file should be scripted to automatically recover from ARPL or M-SHELL.   I think we need to see the trend after u3, but we are going to patch for smallfixversions that are larger than u2.   M SHELL has nvme-cache addon installed by default, so we plan to implement it here.