Intermittent problems with connecting to the internet

I have just recently come upon a problem that happens sometimes (only sometimes) after booting up my computer. For some reason, the internet will just not allow me to browse, and then when I sign out and back in to covenant eyes the internet starts working again. But, it only works for a short amount of time before it shuts off again. My wifi card has been failing, and so I've been using a USB wifi adapter (supposedly one of the best). I'm not sure if the USB wifi adapter is a factor. In fact, I thought it was the problem until I somehow stumbled upon the covenant eyes factor. Sometimes I'll turn on my computer and the internet will work without any problems (hence "intermittent" in the title), and I haven't been having this problem until this past week. However, I believe I've correctly identified covenant eyes as the culprit. I would greatly appreciate some assistance with this problem.