Be careful with an April update.

Right after this update (not after a few hours, days or weeks) my Flip 4 stopped working in a proper way. Every time I fold or unfold my phone it's totally shutting down. Folding feature still works only when my phone is connected to the charger.

So, now I have 2 options: to use my phone only in an unfolded state or to carry a power bank always connected to my phone.