Router: Netcomm NF4V
(If this helps:)

Software version: GURNV5.OT132A-8-NC.Orcon-R5B036.EN

DSL PHY and Driver Version: A2pv6F039i.d25b

Internet light stays constant, however all connected devices lose connection until router is restarted.

Happens around 2 or three times a week, usually in the evening.

What are my options here?

I have a Fritzbox (ex-Snap) which I'm happy to copy the settings to and use as my router. That thing worked for years without any fuss.

Can I try a Firmware upgrade?

Not worth calling the team over, intermittent issues are a PITA to resolve then and there, but what can I do to help troubleshoot/maintain stability?

Thanks in advance for any help.