Synse v3 - Devices drop out of scan, then reappear.

[MatthewHink]

Guessing what is happening is that when devices are being refreshed, the device collection is being cleared and rebuilt. This causes the scan to miss devices.

If that is what is happening, propose to rebuild the device collection in a new area, then flip the pointer to the rebuilt area once the rebuild is complete.

Sample scan with missing vem plc and ups devices: synse-scan-missing-vem-plc-and-ups.txt