We have been running into an issue where upon saving an invoice or a sales receipt, we get a duplicate: same information saved twice but with a different invoice id/number and sales receipt id/number.  I have logged a ticket but so far no response.  It happens frequently enough that it is throwing off our financials and inventory.  It's causing a lot of re-work.  Anyone else experiencing or have experienced this issue?  Our internet connection is slow (in Africa), could this contribute to it?  Any way to prevent it?