Sounds like your water pressure could be low as well in your new house.
I replaced my 4040 Membrane 16 weeks ago due to my tds climbing. I have had 16 weeks with 0 tds produced just by the RO only. My original membrane did not last 18months.
I put a really good Chlorine Filter in now and I run my water through on flush set up all the time. It still produces 250 ltrs of pure water an hour, Though this is down to the pump I have installed.
I bought if from MachineMart, Its the CBM240E 1" Multi Stage Electronic Booster Pump, Costs £211.48, well worth it.
Nel