Tiny particles in XT-3 after a day

I started using XT-3 (1 liter) a couple of years ago after having used X-tol (5 liters) for many years regularly.
I never had issues with X-tol, but switched because of the convenience of the 1 liter solutions.

Every time I mix a fresh solution of XT-3 I notice already 1 day later tiny particles building up in the solution.
When I developed films without filtering the solution through pantyhose, they came out with tiny specks (so the tiny particles influence the development).
When I develop films with totally fresh solution just mixed, they turn out fine.

I've been having this issue with XT-3 every time, with varying production batches of the powder.
I mix and store the solutions exactly the same way I did with X-tol, same location, same water, same sealed glass bottles. X-tol used to stay fresh and clean for at least 6 months.

Has anybody else had issues with XT-3?
Any ideas where this can come from, considering it never happened with X-tol?

Many thanks in advance!

I use XT-3 regulary since 2 years. Mix as a 2:1 concentrate with 500ml water instead 1 litre. Fill it in some 50ml glass bottles to avoid oxidation. I never had any issue.

Maybe you have an issue with your water. I would try to avoid the issue by using a different water source and filtering the solution.

Another idea: At which temperature do you store the solution? Maybe it is too cold?

This might be of interest.