Excel VBA中大约每10,000次迭代出现无法解释的类型不匹配错误

I have a VBA macro that uses Microsoft MapPoint to calculate the distance between two locations for each record in my spreadsheet. I have about 120,000 records to process. The program runs smoothly for about 10,000 iterations then returns a Type Mismatch error where I define the MapPoint locations in my error handler. At which point, I select 'Debug' and then resume execution without editing any code, and it will run successfully for another 10,000 or so records before the same thing happens again.I have a VBA macro that uses Microsoft MapPoint