Hi all, thanks to Bastian i have solved my problem. So the problem was due to zero padding between regenerated frames as Bastian said : "The padding shouldn't be all zeros but contain a small amount of noise. If you send an all-zeros stream of samples, the receiver will constantly divide by zero, which leads to undeterministic behavior and random frames get detected." . So I have changed the zero padding implementation and added some noise instead of having zeros and now the receiver can decode all frames.
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