1. A method for mitigating potential frame instability by an electronic device, comprising: obtaining a first frame of a speech signal subsequent in time to an erased frame, wherein the first frame is a correctly received frame; generating a previous frame end line spectral frequency vector with frame erasure concealment; applying a received weighting vector to a first frame end line spectral frequency vector and to the previous frame end line spectral frequency vector to generate a first frame mid line spectral frequency vector, wherein the received weighting vector corresponds to the first frame and is received from an encoder; determining whether the first frame is potentially unstable; applying a substitute weighting value instead of the received weighting vector to the first frame end line spectral frequency vector and to the previous frame end line spectral frequency vector to generate a stable frame parameter in response to determining that the first frame is potentially unstable, wherein the stable frame parameter is a mid line spectral frequency vector between the first frame end line spectral frequency vector and the previous frame end line spectral frequency vector; and synthesizing a decoded speech signal based on the stable frame parameter.