When QBmapi64.exe uses too much memory, it causes instability in the system and causes the "QBmapi64 out of memory Error" in QuickBooks. Large business file sizes, low RAM, or program conflicts can all cause this issue. The solutions include upgrading QuickBooks to the most recent version, increasing RAM, or optimizing file sizes. Please call us at +1.833.802.0002 if you would like to talk with a QuickBooks support specialist right away.