Please wait until matic checkpoint arrive with your previous transaction

Attempted 3 times to transfer ETH from Polygon network to Etherem Mainnet using PoS Bridge, Using Coinbase wallet.
all transaction got stuck on pending for 18 hours and failed. I cleared transaction list on Bridge page.
I tried a 4th transaction which actually reached the “Waiting for Checkpoint” but the pop up states : Please wait until matic checkpoint arrive with your previous transaction.
But all previous transactions failed!