I had a similiar issue and finally figured out it was because I gargled water every morning!! Not sure why I was doing that but it was just a habit. I thought it might have been that also just like you said. I think what was happening is the lining that protects the throat was getting washed away continuously and my throat was really sore! Be aware, I could tell once I stopped for 3 or 4 days that it was clearly getting better and finally was 100% again.