In a statement Fitbit sent to ArsTechnica, the company claims to have investigated the matter which also involved the testing by a third-party company, and came to the conclusion that there was nothing wrong with her device, at least not inherently. They claim that the explosion came as a result of external forces that caused damage to the device that caused it to explode.
The statement reads, “We were greatly concerned by Ms. Mitchell’s report and took swift action to understand the situation. Based on our initial investigation, including testing of her device by a leading third-party failure analysis firm, we have concluded that Ms. Mitchell’s Fitbit Flex 2 did not malfunction. The testing shows that external forces caused the damage to the device.”
Fitbit goes on to add that they have not received any other complaints of this nature (which as far as we know is true since we haven’t read anything similar ourselves), and that customers who own Fitbit devices like the Flex 2 can continue to keep using it without any issue.