(normally 200ms but now will suddenly go up to 400-500ms).Is below normal?
Where are your game servers? What was the issue on your building switch?
The baseline latency on your graph is around 5ms which is around what I'd expect from Hyperoptic and can be a perfectly good connection for gaming. The big spikes of yellow - were you downloading something at those times?
200ms indicates either something wrong or a server a long way away, you can get to West coast USA or Singapore in less than that. 500ms definitely points to something wrong, you can reach a datacenter in Australia in under 300ms.