Please supply more information
a. Have you applied audio transitions to your Timeline content?
b. Does the issue exist in a new project?
I have seen this error reported here recently. In one, the issue went unresolved.
I am recalling one thread where audio transitions were are the core of the issue. I will try to find that thread(s).
To be continued....
If audio transitions are involved, please trim the audio clips associated with the transition and then reapply the transition to the trimmed audio clips.
If you need further details, please do not hesitate to ask.