It means your bucket has too many nutes in it.... you'd need to drop that ppm ... it's easier to see the fluctuations that are serious if you calculate the EC rather than just looking at the ppm.... and it's a fairly easy computation - (ppm/1000)*2 ... If your EC is rising and your pH is falls by more than 0.5, I would change out the bucket and lower the EC...
There's a good chart I use (but I don't use it as a "bible" as sometimes what it's telling me is not what the PLANT is telling me) ... but you can find it here about half-way down the page.... it's called Hydro, pH and EC Imbalance Chart ... https://percysgrowroom.com/ec-and-ph-fluctuations-in-hydroponics/
Good luck!