Horrible Internet Service

In April 2015, an AT&T tech was doing something with the box/hub in the neighbor's yard that our U-Verse is connected to (they weren't working on it for us - I just happened to see them out at the box).  Ever since that visit our internet service has been awful.  TV and Phone work fine, but the internet cuts out every hour or so.  We have to full reboot the modem before it comes back for another hour.  Obviously when we call support and they have us do that and they run a line test, it works again (cause hey, we told them that would happen when we explained the issue).  We were sent out a new modem around May 2015.  The issue is not resolved.  It's particularly bad in the evenings (I'm assuming due to load) - then it becomes sometimes an every 15 minutes issue.

We thought it was just a wifi issue (we don't have PC's hooked up via ethernet cables due to where the office in our house is and where the modem comes into the house).  We went so far as to purchase a wireless router, hook it up via ethernet and use it for the wifi (we disabled the wifi that was built into the modem).  That works only marginally better so it seemed to be affecting the ethernet as well.  So we moved a PC down next to the modem and hooked it up via ethernet and it exhibited the same issues (though not as frequently as the wifi).  It's connected to the modem but you can't browse the internet - timeout errors, DNS not resolving errors, etc.  Reboot the modem and bam, all is well again until it happens again.

So obviously a new modem and a new router haven't resolved the issue.  And we never had issues before that tech messed with the box in April.