There are a number of things that can cause this behavior. A failing power connector, rubbing or bent props, debris on the motor shaft, bad PIDs, or a damaged component are a few. Running your batteries lower than 3.2v will result in degraded performance. Also, please verify your battery is fully charged.
Some possible solutions are to verify your PIDs match the following
If you have another power connector please solder it on to see if it resolves the issue.
If the above does not fix your issue, please submit a ticket with your order number and a description of the problem.