Kernel cannot find root fs

We are a cloud service provider.
some of our customer reported that system hang at booting.
After investigate we found that the new updated kernel (4.18.0-553) could not find root fs.
The managed to resolve the issue by folloeing the below steps:

  1. reboot
  2. press e
  3. select older kernel (4.18.0-513)
  4. The issue is resolved

Kindly, update you kernel to avoid this issue