Why can't I get my iPad to stay connected to my printer?

I am having trouble getting my iPad to stay connected to my printer. I have set up the printer numerous times, but every time I try getting it to print a second time after it prints once,my iPad sends the message that it can't find an Air-printer. I contacted the retailer where I purchased it and he told me to do a reset by pushing the Home button and Sleep button at the same time. That seemed to fix it, but when I tried printing something the next day, it was back to the same problem and got the message about not finding an Air-printer. Can someone please advise me as to what I can do to overcome this problem?