FNB online rejecting valid password

I attempted to log on to Online Banking via both the app & on a PC, & it rejected my valid password. I managed to change my password but I shouldn't have had to do this - I did not change my password before & I logged on yesterday with no issues. I have read a few Hello Peter complaints describing the same issue. I also knew I had entered the correct password when I attempted to change my password & put my last password in to check - it then told me that I could not use the same password as before, so this obviously told me that I was definitely using the correct password. Please assist - it's not okay for your clients to have to be forced to change passwords with no notifications whatsoever. The only thing the queries agent could tell me was that there was maintenance this weekend.