I think Brian suggested solution... of dumping it and signing up with different company?
Almost put mine under car wheel, then... spotted a 'reset' pin-point hole, on left hand side.
Never tried before.
Poked it with the pointy bit... of tablet recharge cable.
Truly, perfect now. Almost Immediate response.
Brilliant shining lights, inc green 'online ok' one, that had vanished entirely, no hiccups, continuous connection.
SFR tech. had told me that I needed the all-new updated box.
It didn't work, so tried the old...dire neufbox again.
hooray for a good connection.