Im not saying slush is doing this..but I know its possible to move a stratum port to another pool  >> say a pps pool for a few hours.. Then swap it back.. All within the time so your machine will never notice.. This is a major issue i have with putting trust into another pool.. This should never have had to be an issue if we all stayed more decentralized!! ie solo mining.  

this could explain the odd swings in hashrate we been experiencing idk..

d57heinz