Unfortunately this may be a reception issue due to interference. Some channels may experience more interruptions then others depending on signal strength and what interference is in the area.
Two approaches are to buy an antenna that is bigger or one that is called “active” which will require an available power outlet. The other is trying to move the antenna outside, at the highest elevation as possible and clear of trees that may be between the antenna and the transmission tower, if possible.
You can identify the transmission towers in your area and the signal quality you may be receiving for channels. Use this information to justify what size of antenna you will need. If you need further help, I’m available over the phone at
https://www.6ya.com/expert/chris_51d7c1b240c21e38