I am one of the unlucky folks, my iOS mail client shows "weak consistent" list of emails, sometimes I do see a new email coming in but after refresh it vanishes

I am one of the unlucky folks, my iOS mail client shows "weak consistent" list of emails, sometimes I do see a new email coming in but after refresh it vanishes from the list. The iCloud Mail webpage no longer loads / load with a blank 3 column page, then a reporting error modal pops up: " ENVIRONMENT INFO PROD REPORTED ERROR TITLE Startup Failure: Unable to fetch messages (INVALID RESPONSE SHAPE) REPORTED ERROR TYPE CANNOT_LOAD_STARTUP_DATA LINE NUMBER Unknown "