I bought my HD400 about 11 months ago and a few months in my "A" foot switch started feeling "crunchy" when pressed and didn't always activate.  It got worse so I had it repaired under warranty at a local shop.  It worked great for another few months but now it's getting bad again.  I've got one month left on the warranty and will be taking it in to get "fixed" again. 

I'm wondering if anyone else is having this problem and if it's common? 

I could also use advice on what to do a few months from now when it most likely will stop working properly again and it's not under warranty.  I use this thing pretty gently in my man cave at home, so this is pretty disappointing.  Is it possible the repair center I take it to doesn't know how to fix it right, and I need ot send it in to Line 6?

Thanks