I have been having quality of service problems for over a month now. I have tried three different modem/routers - Billion, Draytec and Fritzbox, with 5 different devices, pc, laptop, phone, ipad and smart tv and the same problem persists, continual dropouts. BT have tested line and it appears to be synching well they have also apparently moved to a different VLAN but I am still getting [censored] service. Zen my ISP have had me disconnect all phones and plug directly into test socket but the dropouts still occur.
The link below is monitor of last night. No internet use between 10:30pm and 8:30am. Dropouts seem to coincide with that yellow latency spikes.
Any suggestions of the root cause of the problem please.