Up until recently, I didn't notice any problems with my wonderful Sony STR-DA4ES receiver, that is until I opened up and watched "The Rundown" earlier in the week in DD 5.1. During certain parts of the film, the sound level would noticabley decrease, and then return to the normal level again. One specific part I noticed was between 131 minutes and 47 secs and 132 minutes and 01 seconds. It seems almost like the volume was turned down, and then turned back up. I thought it was the DVD, so I got it replaced, twice from different stores and got the same thing. I tried the DVD in different DVD players connected to the 4ES and got the same result. I tried both optical and coax, and got the same result. I then decided to try another movie to see if the same thing was occurring. I put in the Mummy Returns (DD 5.1), and for example, between 11:35 and 12:25, the sound lowered. My best guess is that it has a problem with decoding DD 5.1, as I haven't noticed anything with DTS or Pro Logic as of yet. It seems that it is the receiver, but before I take it in for repair, is there anything else that I could be forgetting to test? Speaker connections seem good, and if it was the speaker connections I would think that the problem wouldn't occur at the same time every time through different players. Please help!