Yes that were I am having the most problem sorry I did not say that .My Speaker works fine I tested it .
You have to be careful with headphones and external speakers on these scanners. Still not clear if you were/have used any sort of external speaker.
I bought a 785D new YEARS ago and it had a bad speaker from the factory, very distorted audio, rather than sending the scanner back, I was able to purchase a better quality replacement speaker and it worked fine after that.
Suggest you use an external speaker to see if the audio stabilizes as a test.