Why do I keep getting DNS server errors/timed out errors?

In the last 4 weeks, I've had to do three system restores just to regain access to the internet.I've never in my life had to do a system restore to access the internet. The first time, sometime around June 17th, I inexplicably got "DNS server error" and "Windows 10 could not automatically identify proxy settings" even though they were. It worked one minute, and the next it didn't. I tried flushing the DNS but that didn't work so I tried a system restore. 5 days later, I got another error, this time saying "connection settings have been changed" out of the blue again. I had to do another system restore. Now I got "website took too long to respond" and I had to do yet another system restore. These are occurring out of nowhere, when the internet has been working fine. I could access couple websites (google and facebook) but for the rest, I kept getting these errors. I know it's my laptop/Windows 10 because I can go to all those sites on my iPad. I have an Acer Aspire laptop.

You could also try switching to different DNS address, either OpenDNS or googleDNS.
Go to WiFi status, Properties and highlight IPV4, change the address in Properties.

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