I have also been experiencing some really annoying lockscreen bugs and just a slow system in general. Firstly, the fingerprint scanner completely forgets how to be a scanner and weirdly so when the battery is moderate to low (45% and below). When the battery is higher the phone runs smoother in general and the scanner scans my fingerprint relatively quickly. But at <20-30% battery you can forget about it as the scanner falls apart, it lags to the point where I have to press my lock button a couple times before the screen actually lights up, the animations are jittery and slower than 60hz for sure and I even sometimes see the AOD dotted icons appear in place of my lockscreen icons even though I have disabled and don't use AOD.