DNS issues on PCs but not Mac

Recently all of our PC’s in the house keep cutting out of internet. It’s to the point where it takes 10 mins to get online and then it cuts out a few seconds later with a DNS error. We’ve tried everything online suggested and nothing has worked (even using google’s DNS etc). Haven’t had an issue at all with my MacBook.
We also have a TP-Link Deco mesh system set up, so we thought that was the issue, but we can’t seem to figure that out either.
 
Even though the TP-Link Deco may be new, that does not mean it is loaded with the latest firmware. Go online to the TP-Link site, find the support/download section and get the latest version of the firmware.
 
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