[Discseven]

Yeah... that ain't right Gordo. Like Mhack, my U channel rusted out and when it does...no telling what position the glass is actually in down below. Symptoms start as you are experiencing. This does not guarantee your channel is rusted.

You can check for U channel decay by raising glass slightly (compared to where it is in pic) and pull up on glass gently and push down. Got to be careful with this so as not to make bad situation worse... but it is a way to check channel without removing speaker (if you have door speaker.) If you know how glass feels when it moves normally---there's a very slight play up and down... you'll notice glass does not move as it should when U channel is rusting out. There's a "stretchy" feel to it.