Cleanbrowsing breaks my internet

I just started using clean browsing and the free parental DNS servers worked fine for one day and it went so well that I decided to pay to further customize it. I began using the paid DNS servers which also worked great for one day. Then all of a sudden my internet connection stopped working and every time I took away the clean browsing DNS servers it begin working again. Then I would try the free servers as well as the paid DNS server addresses and both would work for an hour or two and then the internet would stop working again. I have used OpenDNS for many years with no trouble whatsoever. So I’m wondering what is going on to cause cleanbrowsing to not work with my internet. I’ve contacted the support email as well and they’ve not been able to resolve it yet either. I’m hoping somebody here will have some more information?