if you are using paper from a reem of paper look on the edge of the reem, there will be an arrow somewhere, make sure you put the paper in the printer so the way the arrow points is the top of the paper, also make sure you "fan" the paper before putting it in the printer to seperate the sheets. if it is still taking in 2 sheets at a time it is probably worn take up rollers.
I've just checked the two reams I have here and neither of them atually have the arrow on them :) in this case make sure the packageing is correct way up, paper does have a top and bottom when used in printers and photocopiers due to the tiny bend on the edge that is caused when it is cut, if you get it the wrong way up one sheet won't slide smoothly off the one under as the tiny bend wil snag.
marky ... you must be at least as old as me if you remember the direction arrow.
things have moved on since then .... they don't use reeds from the bank of the nile or deerskin and charcoal any more ... now it's called
p. a. p. e. r. ..... ;-)
black
two things that might help
when you take a chunk of paper from a stack ... you need to "break" it (actually for the same reason you don't get a direction arrow) because paper these days is so flat and well finished that there is no air between the sheets ... so they act like suckers and stick together.
hold sheaf by bottom corner .... run your thumb across the diagonally opposite corner to fan the sheaf and break the seal
despite the high quality of paper ... it's still just a blob of sawdust ... rolled flat ...
over time the rubber drive wheels get coated in particles of the fine top surface of the paper and become so slick that they don't have the friction to handle the paper properly.
use a slightly dampened cloth on the rubber rollers (you'll need to do it several times) ... or if no joy gently rub with a damp ened bath scourer (careful) - (and don't use a panscrub ... too rough!)
or finally ... use very fine emery paper (this should be the absolutely LAST OPTION you try)