Sony CDX-C5850

I've recently purchased this audio system for my car and I've got to say it's not bad. But there are a few slight problems that I don't really like about this system is that when I turn off my car and take the keys out, the system remains playing for about 20 seconds till it finally turns off. I am not sur eif it's just mine or it's the same with all sony's. Another thing is that I've got to turn the volume pass the 50% to actually get it going.. but it's 40 watts ! hmm
well over all to say.. I like it! and I do recommand my friends into getting it.