Data issues
I've had no problems but O2 gave notice they were doing maintenance of a lot of services from Friday until today. This might be the reason https://www.o2.co.uk/help/phones-sims-and-devices/system-maintenance-notification
You could also check your network status here https://status.o2.co.uk/ and see if there are any mast issues..
Best of luck and welcome to the forum 
Hey @WendyWoo how are you getting on with your data issue? Are you still having problems?
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This is to do with your previous thread here https://community.o2.co.uk/t5/Pay-Monthly/Data-issues/m-p/1249791#M170919
I will ask for it to be moved for continuity 
Hey @WendyWoo I'll pick this one up for you and see if I can find out what's going on with your data situation. I'll need a bit more info so I'll send you a private message so we can go over the details.
→ COVID-19 support - Help and support from O2 during the lockdown
→ Access for You: Registration - Find out how to register for our Access for You service.
→ Just joined the community or thinking of registering? Check out this handy starter guide!
→ Have a query about your account? See if the My O2 how-to guide will help
If you'd like to take part, why not register?
