Intermittent connection

I’ve been having this issue for months where my connection is perfect for maybe a few days to sometimes over a week, then it will just completely disconnect for hours, for days if not weeks. 

I’ve had an engineer come round, they replaced my hub with a hub 5 (originally a hub 3) which seemed great at the time but the issue just never fully went away. Done all i can to attempt to fix it, but realistically there’s not a lot i can do.

this is todays connection: https://www.thinkbroadband.com/broadband/monitoring/quality/share/42b53d2b86f43b5e4cb51298e5366c734a636424

The above images are some of the worst days ive had but there have been only maybe 5/6 days like this so far (a majority of the time its just 20 minutes then its back for maybe 15)