Welcome to NT

I don't have anything to add as to what it could be. Looks like mrsD gave you great info to start off with your search. I think that's the hardest, knowing something is not right and paying for things that don't help. I've been there. NO fun!!!

I do hope you find some answers soon.

The search feature is very useful.

There's lots of info here. Ask if you need to know how to get around.