Smart meter not sending readings to bulb any more

Hello. I have a smart meter from bulb.
I’ve noticed that over the past couple of months bulb hasn’t received any smart readings instead using estimated values.

The screen display thing all seems fine showing usage and costs etc, but they aren’t being sent to bulb.

To be clear, the readings did used to send (as I can see historic smart readings in the bulb app) just nothing smart since about 12th April.

The SKU1 cellular fitted on top of my meter has sporadic flashes for all lights except mesh. All power and gas is working.

Any ideas?