4G and 4G+ gotten progressively worse

[Turbobuddah]

O2 coverage used to be amazing in our town (GL5), Over the last couple years though it has gotten really shocking. Can walk through the center of town at non peak times of the day with 4G+ coverage and the internet may as well be disconnected. 4G signal has gotten noticeably worse too, currently sat at 2.7mbps download speed and it's struggling to upload a 70mb gif which is pathetic
This isn't just a bug or an off day, it's been worsening for some time
Multiple devices too, different apps and/or websites, also friends and family have noticed it too, it's a provider issue
Honestly putting me off renewing next year, only seems to be O2, just wondering if anyone could shed some light on why it's gotten so poor?

Thanks in advance

[Bambino]

@Turbobuddah You can check here to see if there are any issues in your area: How can I sort out my network issues? - o2uk

It may just be local congestion, but if, as you say, the problem is only with O2, the solution for you when it comes to renew is very simple.

[jonsie]

Hopefully a mast problem and not a mast that has been decommissioned.