Grounding Changes for Copilot in Outlook

Ever since I've had a cull Copilot licence I've used prompts to summarise emails in my outlook folders. It's always worked well until 1-2 weeks ago when it's returning content outside the selected folder and or only reviewing a few of the emails in the selected folder.  I've revised and reverse engineered the prompt but it's still not working and more worryingly it gives a variation every time.  Does anyone know why this is happening or the workaround? Ultimately all I want it to do is summarise each email and drop all the emails into a table.