The TMC is reducing the amperage from the maximum 32 amps down to 16 amps for a reason.
Old/worn 14-50 receptacle or loose wire connections. Have an electrician check the 14-50 receptacle for signs of overheating.
Check that wire connections are properly torqued (requires a mini-torque wrench.)
Replace cheaply made builder quality receptacle with an industrial one from Hubbell, Bryant, Cooper or Eaton. Else,
Replace TMC with Tesla Wall Connector (TWC) (note that the TWC must be hardwired); TWC enables charging at 40 amps when used on a 50 amp circuit.