mac pro wi-fi connectivity issues

I have the same problem it seems that many people are having with Wi-Fi connectivity issues. I have Macbook Pro, just purchased in December 2015. My computer goes to sleep and when I open the cover it looks like I am connected to wireless but I really am not! I go to websites and they won't open. I disconnect my wi-fi and reconnect and sometimes that works, but sometimes I have to actually restart my computer. For the time being, at the end of the day I am going to shut down my computer and restart in the morning I guess. It does occasionally appear to lose its connection during the day as well, I suppose because it goes to sleep. Very frustrated. Just got this computer in December and have had this issue since using the computer out of the box. I was told it was because I had not done my El Capitan update, do did that, but that was not the problem. Tech support suggested a couple other things which we also went through and those did nothing either. Not sure what the issue is or how to resolve this issue, or even if I can if so many others have this issue. I am thinking this is an Apple issue and wish they would admit to the problem and try to find a solution. Love Apple, but right now pretty disappointed. Pretty expensive computer for the issues I am having. I switched from a Dell to an Apple thinking this was the best thing since shirt pockets, hmmm.... I do not feel this is any issue with our modem, router, wireless, etc. because we have other computers, iPads, iPhones in this house and have NO issues. So, I hope everybody isn't running out to buy new routers and modems because doubt that is the problem at all. PLEASE APPLE, DO SOMETHING TO FIX THIS ISSUE!!