Thanks for taking the time to post on the community. It's nice to have you here.
My apologies that you are experiencing intermittent broadband connection. I can imagine how annoying this must be.
I've run some checks on your line and the downstream power levels are too high at + 14 dBV. I would like to book an engineer to check this for you. I've sent you a PM (purple envelope icon, right corner) with some details for you to confirm please.