I'm not sure I know what you mean when you say you've checked and you haven't received any issues likes this but this situation is a problem.  I've been importing transactions from multiple sources (banks, credit cards, etc) and the process of uploading through quickbooks online is very unreliable.  Every month I have some account transactions missing on import.  Could you guys make this a priority to resolve?  What I think you are missing is the fact that every time information is missing on upload the end consumer has to reconcile the account manually to figure out which of the current months transactions are missing so that we can manually upload them.  This is a problem.