Part 107 UAS pilot reported a lost link during flight. During the flyaway the UAS struck a tree and crashed.

Narrative

On Day 0; my coworkers and I headed to Location A; to fly the research unit's drone to collect soybean maturity images. The drone model is the Matrice 600 pro with recently up to date firmware from DJI Assistant and attached is the Zenmuse Z30 camera run on firmware V01.00.07.10. It was a clear day with few clouds in the area; visibility was great; and the winds were low at 7 mph. I set up the drone following manual protocols; checked pre-flight take off list; and set up our flight map. We use the app Pix4D Capture to fly our missions by creating grid flight maps to capture large orthomosaics. The flight mission was supposed to take 10 minutes and 43 seconds; with an altitude set at 150 ft; and a grid dimension of 171ft. X 328ft. Once the drone turned on and connected to the controller and app; I set the home set point location. The drone passed all pre-flight checks in the Pix4D Capture app and took off to start its mission. At the very end of the flight the drone controller started to beep; due to the low battery warning set at 30% battery life. At this point; the drone then took off at a higher speed; 90 degrees from its intended path of flight. When I saw that the drone was acting abnormally from it's intended flight plan; I pressed the 'Return to Home' button on the remote controller; however the drone did not respond. As I kept pressing the return to home button; the drone continued to fly farther away from us and the home set point; quickly losing sight due to the distance. I no longer could see the GPS location of the drone on the Pix4D Capture app. I then tried to manually take control of the drone; but it kept flying away even with manual input. We began to lose sight of the drone in the tree line and once that happened; we drove to its last visual location. After looking for the drone; we found it had hit a tree. There was no injury to anyone and no damage to property besides the drone itself.I have been flying this drone for almost two years; using the same Pix4D Capture app and have never had anything to this extreme happen before. After doing research online; I saw that this can occur and what had happened was a 'flyaway'. I looked further into flyaways and saw that most flyways happen when the link between the controller and the drone gets severed. This can be caused by electromagnetic interference; which can cause compass interference in the drone and controller connection loss. After researching further; I believe there was an electromagnetic interference causing the drone to have compass issues; making the drone not know the location where it was and disconnecting the controller to the drone. So; when this disconnect happened and a fail-safe return to home happened; however the drone didn't know where the set return to home location was; taking off in the opposite direction to find the home point. This is my theory after doing some research and from what I experienced that day.