Gaps in data saved as LVM

I am using 2 USB-6009s to collect 16 channels of analog data and the 2 devices are not synced. The data files attached were collected at 1,000 Hz for 2 sec using the Write to Measurement File function.
1. When the data were saved as a text (lvm) file [the csv file attached], there are gaps in the data. However, there are no gaps when saved as an Excel file.
2. When saved as Excel with 'absolute' timestamps, the time column starts with 00.000 and then reset to 00.000 at non-regular intervals (as in the spreadsheet attached). The time column has continuous time when the 'absolute' option is deselected,
If the gaps are related to the non-synchronization of the 2 devices, why are there no gaps when saved as Excel files? Thanks for your time.
Attachments:
Analog_16Ch_Timed_Datalogging_Dell.vi ‏90 KB
AI16_1000Hz_2s(absolute timestamp).xlsx ‏126 KB
AI16_1000Hz_2s.csv ‏304 KB

Hi Riccardo:
At your suggestion, I used the Convert From Dynamice Data to 2D array before saving the array using Write to Spreadsheet File. When I collected 2 seconds of data at 1,000 Hz, there are fewer than 200 lines of data in the spreadsheet file (no gaps in the data, see the txt file attached). For comparison, the file saved using Write to Measurement File has close to 1,000 lines (with gaps in the data, see the xlsx file attached). Thanks for your time.
John
Attachments:
A16D1_1000Hz_2s.txt ‏20 KB
A16D1_1000Hz_2s.xlsx ‏133 KB
Analog_16AI_1DI_Timed_Datalogging(WriteSpreadsheet).vi ‏116 KB

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