The problem with Shredding paper, it all comes in different thickness, so if you grab different pieces of paper to shred, it could possibly be thicker then the recommended amount to shred at one time. Also, plastic will also jam up a shredder with ease. When my Shredder jammed up, I put the Shredder upside down, and pulled as much of those jammed pieces of paper out with Needell-nose-plyers, which usually works. If that doesn't work, then you need to open up the cutting case carefully and see what is jamming it, which I also have done on my other Shredder machine. Plastic is a no, no for these Shredders, as the plastic will jam the Shredder with ease. Hope this helps.

If your Shredder will not shut down, either there is a piece of paper or plastic stuck in the activation button which is in the center of the cutting rollers which will prevent the machine from shutting off, or your Shredder is defective, and if under warranty, just bring it back where you purchase it. Note: never shred plastic into any paper Shredder, as doing so, will make your Shredder brake down a lot sooner!

This Shredder measures, 19 1/2" High, 9" Deep, 14" Wide.

When this Shredder is used continuously using (5) or more pieces of paper, yes, it does make that sound like a squealing fan best, but its not, its the heat which does built up.
Just let the Shredder cool for a moment and don't over-load it which two many pieces of paper. Like all machines which has moving parts, metal parts do heat up and will expand and make some type of noise, really nothing to worry about, just don't over stress your Shredder putting too many pieces of paper into it at once!