Not sure if it's just me but here is another issue I found on my storm.
If I am on a call and am using the speaker phone option it works fine for about 10 minutes or so and then reverts back to the handset. I know that it is nothing I am doing as it is sitting on the desk or bedside table, ect. If I click the screen and again click to send to speaker it works again for about another 10 minutes and so on.
It would seem there is a setting that could be tweaked but Im not finding it.