A current SSLLabs scan shows me this error for OCSP:
Revocation status: Validation error
OCSP ERROR: Exception: ocsp.int-x3.letsencrypt.org [http://ocsp.int-x3.letsencrypt.org/]
OCSP ERROR: Exception: ocsp.int-x3.letsencrypt.org [http://ocsp.int-x3.letsencrypt.org/]
Seems there are some issues with LE OCSP servers, but on the status page everything is green.