Hey, I'm also on Talk Talk fibre optic and got the game yesterday. To my frustration I've been greeted by lions and flys and bees oh my! I literally got disconnected every few minutes so today I thought I'd have a mess around with my connection. I'm not incredibly technical or anything but basically what solved my issue was to change some settings on my modem, not my router, the actual BT Openworld modem. I signed into it with username and password as admin and then went onto advanced settings. I noticed that there was a power saving mode on which I have switched off and also on the firewall the settings were set to "Talk Talk" which I changed to low. Since doing this I haven't seen a creepy crawly or a big cat message since, running absolutely perfectly. I think the issue may have been with the talk talk firewall. Have a go with that as it worked for me!