Transactions from business checking are not sync'ing for 4 days but the account shown $ updated

This is new, previously every transaction from my business account has been synchronized and I was able to categorize. Currently, In the External accounts section I do see an $ updated but there are no transactions at all for a few days not. So, it seems that the connection is there as the total $ is updated and no error showing but why there are no individual transactions any more?