That makes me less anxious that there is a problem and think it's more likely they had a surge of applications and are now backed up a bit. Still hoping for something this week as that would be 2 weeks for priority.
I know it's hard, but don't worry - this is normal for processing times. We got lucky in Jan and Feb that the processing was so fast, but it does start slowing down from March onwards.
Back when they first introduced priority processing, it was a 15-working day service, so even though applications usually took less than 3 weeks, you had to assume that it could take the full amount of time and you couldn't complain to UKVI unless they took longer than that.
After a while, they took out the '15 working days' time limit and just said that priority applications would be put to the front of the line when they arrived... therefore meaning they no longer have to guarantee processing within 3 weeks, which means you can't complain even if it does take longer than 3 weeks, because they can't guarantee a specific timeline.