FNB banking app consistently giving problems

Every time I want to log into my account using the FNB app, I experience problems. I know my password by heart and still, when I key in my account pass3, I receive a message that the password is incorrect?!?! I have visited the closest FNB branch on numerous occasions to try and sort out the problem. The very 1st time I use the FNB banking app, I once again experience the same issue. I am so sick and tired of this, I feel like closing my account and taking my business to another bank. Is there a solution to this problem??? To top it all, I have to travel from another town to get to the nearest FNB branch. Zero online assistance to try and resolve the problem. Bad situation to say the least.