Today I had this issue from 4ish till 5:20 when I left the area. I managed to get some data through just after 5 before it stopped working again.
Here's a screenshot from the testing screen on my android phone:
and a screenshot from a neighbouring tower which data instantly works as soon as I move onto it
when my phone connects to the other tower it instantly fails again.
I'm not sure if this is my phone or what. Briefly tried with an e75 from telecom and that failed too.