(Another) Odor from basement shower drain problem
I know, not another question about shower drain, but I have a problem. I have searched this forum, and read some helpful tips for getting rid of the odor from the basement shower drain. The problem is, about two weeks ago for the first time since I have moved into my house (8 months ago) I detected an odor from the basement shower drain. The shower has only been used a handful of times, so I checked to see if there was water in the drain, and there was. To be safe I used the bleach method and then the boiling water method. Things were fine for a week, until the smell came back. I repeated the process two days ago, and again the smell went away. Well, today the smell is back, and there is still water in the drain. I can feel some sort of cool air coming from the drain though. I have not detected any other odor issues from any other sink, shower, or toilet. And I have not detected any odors from the floor drain in the utility room in my basement. The smell seems to be directly related to the shower. Before I call a plumber, any other suggestions or things to check. If it is any help the weather has been in the 90's for about 3 weeks now, and we are going through the worst drought in decades. I have no idea if that has an effect.
Thanks in advance.
Tom