Unexpected Leave and return for a zigbee device is almost always a mesh problem. Caused by one or more of the following:
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low battery. Solution: new battery.
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device almost out of range. Solution: add more mains powered devices to strengthen the mesh, then do a network heal. (Battery operated devices generally don’t repeat.)
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local interference. This could be at the transmitter end, the receiver end, or anywhere in between. WiFi is the most common culprit with zigbee. Solution: make sure the zigbee dongle is at least 6 feet, and preferably 10, from the WiFi router. Same for the sensor. If necessary, change the zigbee and/or WiFi channels.
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physical blocking. Different materials block signal. Foil backed insulation is a common “mystery” factor. Solution: same as out of range, add repeater devices.
Also, just to be sure: by “telegenesis 375 dongle” did you mean the 357 Telegesis USB stick? The Telegesis products are really popular for prototype design, but have some quirks. Their USB stick comes in two versions, a low power which is really low power, basically intended for bench design, and a “long range” which is more like a typical retail device. If you are using the Telegesis stick, which version do you have? If it’s the low power, that really limits range.