Why are we, all of a sudden, not getting notifications of bookings to our iPhone?

[Peter-And-Melanie0]

We have missed two bookings over the last couple of days. Luckily one wasn't until May but the other was for tomorrow. We could have easily of missed that completely if we hadn't checked our computer. 

I have checked that all the boxes are ticked in notifications and these seem fine.

Is anyone else having this problem?

[Tim-and-Holly0]

Notifications have been sporadic over the past month or so and we use an Andriod.