Some RO questions

[GreenSpottedPuffer]

I have noticed a steady decline in my RO/DI units production over the past few months. To the point that its just a tiny drip every few seconds and takes about a day to make 2 gallons. Its still testing 0 TDS.

I changed the prefilters and DI. I flushed the RO membrane a bit although I don't really know how your suppose to do this properly.

The unit is only about 4 months old so no way the RO needs to be changed.

Any ideas?

Should I take the whole thing apart?

I should also mention, that I don't even really get any waste water anymore. I thought maybe something could be blocked.