@Solla-topee Finally got the time to try and fix this and have successfully applied the update. I will give it some time and see if it drops again.

Another symptom, that hopefully has been fixed by the update, is that very rarely (once, possible twice in the last month) having the power line adapter plugged in has completely stopped all internet from working. I'm fairly certain it happened at least once, unplugging it meant the internet worked, and plugging it back in made it stop... I have no idea why but I realised I'd forgotten to mention it in the original post.

EDIT: I've just moved some things around and the above problem is happening again which reminded me about last time and it's the same thing now. Basically, when the device that connects the router to the mains power is plugged straight into the wall it cuts all internet off. I can still log into my router and it says there is still an internet connection but no devices will be able to access the internet.