Ron,
I am not a computer expert, but when my computer failed to connect to the internet last week when I was on the road I found some information that may explain a lot of stuff.
We ruled out the WiFi as the issue. The computer was completely checked and the first thought was the hard drive, then the operating system, and then it was searched for viruses and malware. Everything was good. No issues with the hard drive, no viruses, the operating system was OK, but there were three pieces of malware.
The malware I had was not something to be malicious, but was installed without my knowledge to either send emails to me for products after I did a search on the computer, or to install a tool bar for a site I had used. I don’t remember the third malware, but the issue with connection was related to either Ask.com, a search engine that wanted me to install a tool bar, or Xfinity (Comcast) my ISP. Both wanted me to install their tool bars which I did not but both were in the background following my searches and activity. One of them had a glitch that caused the inability to connect to the WiFi reliably.
What was eye opening is we all likely have some on our computers and they can not only track us, but apparently can create issues. I now have a program installed that is not only protection against a virus, but it can prevent issues such as I had with the malware. Your computer does not view tool bars as malware, so protection against malware is not an exact science, but the program that was installed to protect my computer will stop those intrusions into my computer from doing anything.
It literally took hours to do an analysis of my hard drive, search for malware or viruses, and check the operating system but I learned this stuff can impact your speeds and how your computer works. I ended up wiping it clean by reformatting, installing the latest operating system and now it is like a new computer.
A word of advice I learned from the computer guys. The worst sites and the most damaging to your computer are porn sites. Some of those sites install malware or viruses that can access your email, email contact list, and play hell with your computer. The message is clear. Stay off them and if needed break out the old Playboy magazines.