Yeah...I would have to agree. I only had mine for 6 days. Yesterday afternoon while it was in the air the app crashed on my iphone causing the copter to freefall from the sky directly into the lake below. It now sits at the bottom of the lake. Unfortunate. I have to agree, although this drone was very fun to fly, my parrot bebop drone has never failed, and definitely never failed so terribly. I'll miss my drone, and most definitely wont be buying a second. It was a nice drone while it lasted.
Not discrediting your claim, but according to the manual when connection is lost with the controller or smart device the Mantis should return to the starting point.
From the User Manual:
RETURN TO HOME
The Return to Home (RTH) function brings the aircraft back to the last recorded Home Point. There are 3 types of RTH:
Smart RTH If the GPS signal is sufficiently strong, Smart RTH can be used to bring the aircraft back to the Home Point. Smart RTH is initiated either by tapping [ RTH] icon in the App or by pressing and holding the RTH button on the remote controller.
Low Battery RTH Tap the Setting icon [Gear] on the top right corner of the screen, and then touch the aircraft icon. Under the “Return to Home (RTH) Settings” option, you can slide the “Low Battery RTH” switch from left to right to activate the Low Battery RTH function.
The RTH function will be triggered when the flight battery is depleted to a point that may affect the safe return of the aircraft.
Failsafe RTH 1. When you are operating the aircraft under GPS mode in the outdoor environment, Failsafe RTH will be automatically activated if the remote control signal is lost for a specified amount of time (3 seconds when using the remote controller and 20 seconds when flying with a smart device). If the signal is re-established after the Failsafe RTH is activated, the aircraft will still perform the Failsafe RTH.
NOTICE: When the RTH mode is activated, the flight path is as follows:
1. If the aircraft is less than 26ft ( 8m ) from the Home Point, it will climb to an altitude vertically first (the altitude is determined by the distance between the aircraft and the Home Point), then fly back at the current height and descend vertically until it lands automatically.
2. If the aircraft is further than 26ft ( 8m ) from the Home Point, and the flight height of the aircraft is lower than the desired altitude, it will climb to the desired altitude vertically first, then fly back at the current height and descend vertically until it lands automatically.
3. If the aircraft is further than 26ft ( 8m ) from the Home Point, and the flight height of the aircraft is higher than the desired altitude, it will fly back at the current height, and then descend vertically until it lands automatically.
Smart RTH and Low Battery RTH can be interrupted in the following four circumstances:
1. Tap [ RTH] icon in the App to interrupt the RTH.
2. Short press the RTH button on the remote controller.
3. Slide the Mode Switch on the remote controller to interrupt the RTH.
4. Short press the right joystick on the remote controller.