I've been with PN fibre a few years, and I got the Openreach modem & (even worse) router combination pack they used to send out. Two devices to troubleshoot, a few times I had to ring tech support because of stale session errors. Got a TP-Link W9980 modem/router, never looked back. Occasionally, I've had to reboot it to get a working connection. Nothing more…
Despite the waste, I'd suggest buying a new VDSL router.