Metal shower head burst open.  How could this have happened?

Having simply turned it on, after 5 seconds I heard a loud bang and water started spurting from the shower head.

It’s worth noting that I’ve had this shower for about 6 months.

I checked my water pressure (admittedly whilst it wasn’t running) and it’s pretty low (below the green area on my boiler).

Should I check the pressure whilst the shower is on?

I had a shower using my second shower which has the same head and it was fine so what could have caused this?

I’m not 100% what make / model it is as my bathrooms were refurbished by a company.