Advice needed

So I moved my girls to their new DWC home 3 days ago. Experiencing a few issues.

1. Plants have stopped growing in height but roots are blowing up!
2. The slowed growth seems to be accompanied with downward curling of established fan leaves.
2. The PH of the nutrient solution seems to spike significantly over night. I feel like I should not have to add PH down every day. There must be something I am doing wrong.

Any advice helps.

I don't know about this sorry. But in order for someone to help you you should add a lot more info about substrate, components of the solution, pH values, basically everything about it. Else it's impossible to tell.

Also, add pics

Take a look at the roots. Check for dark junk on them / roots turning brown. Also the roots can get really twisty. Root rot. It will kill your plant fast. Leaf/root damage, once there, will not come back.

I had it happen to me on my current grow, in a newly made DWC bucket. I had just topped it, it was doing great. 4 little nubs soon to be new colas just starting, when it started looking sad quick. Leaves wilting, getting spots.

What I did:
1. Emptied the solution out of my container.
2. Took the top with the plant up, and best as I could, sprayed the shit out of the roots, first with water to get junk out, and then with Hydrogen peroxide spray bottle.
3. Added a second air pump and stone to ensure good solution oxygenation.
4. Cut a little piece of panda film with a slot to go over the root basket and around my plant, just in case it was a light leak through the basket that caused the problem.
5. Refilled with fresh, half-strength ph 6.0-6.5 solution.
6. Prayed for new growth to survive!

There were only 3 sets of leaves, slowly dying. After a several days, new growth started kicking in, and the plant took off.