I have the same issue with very variable ping response times - sometimes over 6 seconds !
Setting up monitoring on think broadband suggests a regular problem as per below.
This would explain the dropouts in VOIP I've been having regularly and also all my son's complains about lag in games.
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It is past 21/11/16 and I am still suffering from these huge latency issues. At this time, 22:48PM, when pinging google.co.uk the average ms is 455. We really need this to stop as it is affecting our daily life.
Looking at your connection, there is still an SNR fault ongoing in your area. The reference number is F004913718 and the review date is 8th December. I will check this on the day and let you know any further updates.
I can imagine how frustrating this must be and I am sorry for the inconvenience caused.