I have a fair phone 4 that I bought 3 months ago and have had nothing but problems with the power button. I went to the boutique where I bought it and only wasted over an hour of my time. They were completely unhelpful. I have to press the button 2-5 almost every time I want to unlock or lock it and I end up nearly calling the emergency number nearly 5 times a week.
Welcome to the community!
That does not sound normal. Did you already contactsupport about this? Otherwise - depending on your location - the shop might have a certain legal responsibility to provide you a working device within the first 1-2 years after the sale. You might be able to get either a refund or an exchange if you insist. But that is probably something the sales person can’t decide on their own and will have to be escalated to their boss.
Note that the thread you posted this in is about the (newly released) FP5.* I am not aware of this being a common issue with the FP4, so you may just have a bad power button in your device (maybe a faulty connection or something). Since it’s only 3 months old you should easily be able to get a free replacement if that’s the case. Just make sure that you backup all of your data before that, as a factory reset will be necessary no matter wether you get a repair (that you do not perform yourself) or wether you receive a completely new one as replacement.
Edit: *Post has been moved to a new thread to seperate FP5 and FP4 issues. Thanks @Lidwien