Power problem after update

[Paco]

The last update is bullshit. No one of your reasons are valids. Nobody want to admit that something is wrong in the last update:

Is my official power supply not good enough?

I’ve got an official 5V 2A Raspberry Pi PSU but I still see the lightning bolt icon appear in the top right of the screen and every now and again the Pi freezes, should that be happening with an official PSU? The only thing I’ve got attached to the Pi is an Archer T4U AC1200 USB WiFi adapter.