When you change your particle and carbon filters, disconnect the feed line to the RO.
After the filters are changed, flush water through and catch the effluent. A lot of times, the water will have small particles of carbon "dust" that could screw up the RO membrane and/or the flow restrictor. When the effluent, is clear, shut off the water and reconnect the line to your RO. Possibly, you have some small particles stuck where they should not be
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