Wildly fluctuating broadband speed

[mackerel]

My (not fibre) broadband is giving an unreliable and variable speeds.  This is for my laptop as well as iphone 13.  The download speed can change from 19mbps to ZERO mbps within minutes.  Even when there is a claimed speed of 19 the refresh rate on Chrome is very slow.  Attached are speedsd for the last 2 days.

Can anyone in Talktalk help?

[Divsec]

Hi @mackerel are we talking WiFi or ethernet, or both?

Have you tried a 30 minute reboot for your router?

Your post has been escalated but the TT team will not be in till Monday.