@Fera
It could be due to congestion on your local mast, in which case, there's nothing you can do.
You can check here O2 Service Status
Also see guides Guide: How can I sort out my network issues? and Guide: Do you have poor coverage / signal Indoors? This may help Explain / resolve it
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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