I have connection issues every 2-3 months with low SNR and associated noise on the line. The tech comes and fixes it but then it degrades over time and we have to call them out again. SNR Ranging from 4.4-6.0 when its bad and from 9.5-10.5 when its good.
They used to steal the cables on average 3-5 times a year till they moved them to the front of the house.