Try removing anything you’ve added since you noticed the issue.
If not, we’d suggest contacting Samsung directly for assistance.
http://www.samsung.com/uk/support/
Sorry to hear about your battery @Anonymous! Let us know if the above suggestion from @MI5 works for you. 
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Hey @Anonymous how are you getting on with this? Have you discovered to cause of your battery issues?
→ 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?
