Those are very good statistics that you've got there! So you shouldn't have any stability issues.
If you have any telephones/alarm systems/fax machines/ADSL filters connected, I would recommend that you remove them for a while to see if the ADSL connection is stable once it is directly plugged in to the Telkom box in your house.
Faulty or incorrectly used ADSL filters could cause ADSL disconnects.
Once you've ruled out ADSL filters / other telephonic devices as being the problem, then call Telkom to have a look at it.
Lastly, if it recently rained in your area, then that could've caused issues...
Rain is not supposed to influence ADSL connections, but if the manholes are flooded, then if could cause havoc with ADSL connections.