The world is like a giant speed-bump. No matter how fast your going, Somethings gonna be there to slow you down-Cedric Monroe i made it up.
Sometimes paper will tend to warp, twist or misshape due to heat or humidity, usually this can be corrected by fanning the lead edge of your paper stack. also check the rollers in your printer it may help to run a damp cloth over them next time you are going o print. wait a few minutes before you print, make sure the rollers are dry. GOOD LUCK
Instead of a backpack full of padding, get yourself a real motorcycle jacket. One that includes CE rated armor pads. You will get elbow and shoulder protection as well as a spine protector. One can be had for about the same expense as a padding stuffed backpack. My experience shows that while I may wind up sliding on my back, other parts hit first.
If it is getting too hot, it may be a safety feature. Phone the manufacturer with model and serial nbr. They are very helpful over the phone and can tell you what to do.