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Amazon Fire Stick keeps restarting is one of the most common problem and fix the issue.
First check the power supply that is adequate to Amazon Fire Stick or else the Fire stick keeps rebooting.
Check the cables if you are using HDMI extender for Power Supply and also remove all HDMI slots, except the Fire Stick.
Even a faulty adaptor could be the cause of the restarts. Replace them depending on the situation to see if it fixes the issue.
If you want to know more about FireStick keeps restarting issue, reach us to the toll free number @ +1-844-920-4357 for technical support.