What is with all this sediment?

[Glass_A_Day]

I usually keep 10-15 cases of 10-15 buck stuff in the cellar for everyday use. Lately I have noticed that every bottle from Cab to Syrah to Zin that is in the older part of the rotation is loaded with sediment. Now I'm not talking 95-98 vintage stuff. This is all 01 and mostly newer. I pop 90-99 cabs and Italians of quality (read:$$) without this issue. Is this the norm for cheapo bottles in everyones experience? It's not a huge deal, it just leads to a suprise at the end of the night on the palet if I'm not carefull...