Uverse internet intermittent disconnections

I have had this problem for years.  I can have a disconnect that lasts a few minutes or many hours.  It happens much more frequently between 11am-10pm.  I have unplugged everything in my house during an outage to check for interference, and it will make no difference.  I have IPv6 turned off.  When I first moved in and had Uverse installed, my internet was essentially unusable (up at most for 15 minutes at a time).  After many techs, a large portion of the line in my area was replaced due to discovered lightning damage.  I can go days, weeks or months without any interruptions, but it always comes back.  It always seems to start with line 1 disconnecting, but this might be normal.. Do I need to downgrade my service to a single line?