I have done my own investigation and done/found the following:
*Weather does not affect disconnect as rain/shine it will still happen.
*3 Telephone ports in total (1 inactive), both active ports tested with modem over the past year and same issues in each port.
*2 new modems (Belkin N600, now using Asus N600).
*To many network cables to count.
*2 PC's and 2 phones via Wifi may be connected at any one time.
*At all times connection to router is constant, only the DSL & internet light's on modem will go out.
The disconnect can happen at any time of day, whether there is load on the line or not. It can go down for only a few seconds sometimes or up to 10-15 minutes. Lately we have been having upwards of 20+ disconnects per day.
Since March there was a period of a few months before the problem started happening again, profile was reset by Vodafone - Chorus tech was sent out, and problem went away for a further month or too. This happened again and same resolution applied, although this time none of these fixes will work.
We have had a chorus tech twice, now on the third time - each and every time advising there is nothing wrong and they can see the physical line and connection is constant. Vodafone have also tried other things with changing some profile speed (we have been on fastest, now slowest which does not make any difference). Chorus have also physically changed us to another port in the exchange cabinet.
Have also had a look at http://bcc.telecomwholesale.co.nz/, in which we are in the ON/Exchange service area.
If anyone has any suggestions please do mention, willing to try anything.